What lessons can we learn about worship today based on these warnings and commands about worship in Old Testament times in Ecclesiastes 5:1-7 [1] Keep thy foot when thou goest to the house of God, and be more ready to hear, than to give the sacrifice of fools: for they consider not that they do evil. [2] Be not rash with thy mouth, and let not thine heart be hasty to utter any thing before God: for God is in heaven, and thou upon earth: therefore let thy words be few. [3] For a dream cometh through the multitude of business; and a fool's voice is known by multitude of words. [4] When thou vowest a vow unto God, defer not to pay it; for he hath no pleasure in fools: pay that which thou hast vowed. [5] Better is it that thou shouldest not vow, than that thou shouldest vow and not pay. [6] Suffer not thy mouth to cause thy flesh to sin; neither say thou before the angel, that it was an error: wherefore should God be angry at thy voice, and destroy the work of thine hands? [7] For in the multitude of dreams and many words there are also divers vanities: but fear thou God.
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The passage must give some helps concerning public worship because it refers to "when thou goest to the house of God" (Ecclesiastes 5:1Keep thy foot when thou goest to the house of God, and be more ready to hear, than to give the sacrifice of fools: for they consider not that they do evil.
See All...). We understand that the house of God here is the temple and that their worship was much different from ours. Therefore, we do not expect to match every detail. Yet, we can certainly make a healthy application of the thoughts in this passage. I would like to summarize the teachings of this passage in three words: respect, restraint, and responsibility.

RESPECT:

This teaching is not found explicitly but implicitly. That is, we see it by reading between the lines. They are warned not to "be hasty to utter any thing before God: for God is in heaven, and thou upon earth" (v.2). They are also warned against making God angry by not keeping their promises to Him (v.6). All of this points to the need to respect God and to come before Him with reverence (Leviticus 19:30Ye shall keep my sabbaths, and reverence my sanctuary: I am the LORD.
See All...; Psalm 89:7God is greatly to be feared in the assembly of the saints, and to be had in reverence of all them that are about him.
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Although the age of grace gives us a freedom not known under the law, we could still learn from this teaching. Worship services have become flippant farces in many churches. The time supposedly devoted to God has become filled with humor and showmanship. People talk and move around during the preaching. We might do well to remind ourselves that "holy and reverend is his name" (Psalm 111:9He sent redemption unto his people: he hath commanded his covenant for ever: holy and reverend is his name.
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RESTRAINT:

Solomon urged his listeners to keep their foot (v.1), to avoid being rash with their mouth (v.2), and to not let their heart to be hasty to utter anything before God (v.2). They were to avoid making foolish vows (v.4-5). All of this points to a certain restraint in our approach to God. It is true that the New Testament offers a boldness in coming to God, but the nature of the restraint in Ecclesiastes is still instructive. It involves a hesitation to brag on what we are going to do for God; a carefulness in our promises to God. I believe that in our services today we have pushed so much for people to make some sort of commitment to God that we have minimized the seriousness of such commitments. We should still avoid rashness in what we utter before the Lord.

RESPONSIBILITY:

The Old Testament saints are admonished to fulfill any vow they make. Although we are not to be making vows today, there is still instruction for us. We are to keep our promises to God. Hearing the word of God and responding to it makes us responsible for what we have heard and seen. Many flippantly come to the front of the church and make many promises to God that they do not mean and do not fulfill. To whom much is given, much shall be required (Luke 12:48But he that knew not, and did commit things worthy of stripes, shall be beaten with few stripes. For unto whomsoever much is given, of him shall be much required: and to whom men have committed much, of him they will ask the more.
See All...). As we learn of our responsibilities; as God convicts and convinces us of our need to be obedient; as we externally submit to this conviction; so we are responsible to obey His leading. This knowledge gives a weight and gravity to the time of worship.

When taken together, these three qualities of God-honoring worship:  respect, restraint, and responsibility, demonstrate the need to approach the worship service with a healthy level of gravity. It is, indeed, serious business to come before the holy God of heaven and earth. We should approach the service with humble hearts ready to hear His words and heed His call. Ecclesiastes 5:1Keep thy foot when thou goest to the house of God, and be more ready to hear, than to give the sacrifice of fools: for they consider not that they do evil.
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