But when ye pray, use not vain repetitions, as the heathen do: for they think that they shall be heard for their much speaking. Be not ye therefore like unto them: for your Father knoweth what things ye have need of, before ye ask him.
[KJV (1611)]

In your prayers do not babble as the pagans do, for they think that by using many words they will make themselves heard. Do not be like them; your Father knows what you need before you ask him.
[JB (1966)]

When you pray, do not use a lot of meaningless words, as the pagans do, who think that their gods will hear them because their prayers are long. Do not be like them. Your Father already knows what you need before you ask him.
[GNT (1976)]

When you pray, don’t pour out a flood of empty words, as the Gentiles do. They think that by saying many words they’ll be heard. Don’t be like them, because your Father knows what you need before you ask.
[CEB (2011)]

When you are praying, do not heap up empty phrases as the gentiles do, for they think that they will be heard because of their many words. Do not be like them, for your Father knows what you need before you ask him.
[NRSV (2021 ed.)]