Matthew 6:7
But when ye pray, use not vain repetitions, as the heathen do: for they think that they shall be heard for their much speaking.
Cross-reference
Matthew 6:32 also contrasts Gentile behavior (seeking things) with trust — parallel to contrasting Gentile prayer with sincere prayer.
Matthew 26:39 contrasts Jesus' brief, submissive prayer with the verbose, self-centered prayer of pagans.
Matthew 26:42 again shows Jesus praying concisely with surrender — opposite of the babbling pagans in Matthew 6:7.
Matthew 26:44 has Jesus praying the same words a third time, but with heartfelt submission — not vain repetition.
1 Kings 18:26-29 shows Baal's prophets shouting and cutting themselves — the very pagan babbling Jesus condemns.
Ecclesiastes 5:2 warns against hasty words before God, urging few words — directly aligning with Jesus' rebuke of many words.
Acts 19:34 depicts pagans shouting 'Great is Artemis' for two hours — a vivid example of the vain repetition Jesus warns against.
Job 35:13 says God does not hear vanity — directly parallel to the ineffectiveness of vain repetitions.
Mark 7:7 condemns vain worship through human traditions — directly parallel to condemning vain repetitions in prayer.
Mark 12:40 condemns long prayers as pretense — directly parallels the warning against many words.
In Mark 14:39, Jesus prays the same words again — showing that repetition in prayer is not vain when done sincerely, contrasting with the heathen's babbling.
Ecclesiastes 5:7 declares many words meaningless and calls to fear God — matching Jesus' critique of pagan verbosity.
Isaiah 1:15 says God hides from many prayers due to sin — another reason prayers fail, complementing vain repetition.
Ecclesiastes 5:3 links many words to foolishness, reinforcing Jesus' point that babbling is empty.