Charles Ellicott Commentary Psalms 119:164

"Seven times a day do I praise thee, Because of thy righteous ordinances." — Psalms 119:164 (ASV)

Seven times: Some commentators think the number is used here only in a general way for “often,” “repeatedly;” but the number seven evidently had some sacred association for the Hebrews (Proverbs 24:16; Matthew 18:21, and others). No doubt the seven canonical hours were partly derived from this verse. Elsewhere we find three times as the stated occasions of prayer (Psalms 55:17).