Word: let in Ecclesiastes

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.

Ecclesiastes 9:8

Let thy garments be always white; and let thy head lack no ointment.

Ecclesiastes 11:8

But if a man live many years, and rejoice in them all; yet let him remember the days of darkness; for they shall be many. All that cometh is vanity.

Ecclesiastes 11:9

Rejoice, O young man, in thy youth; and let thy heart cheer thee in the days of thy youth, and walk in the ways of thine heart, and in the sight of thine eyes: but know thou, that for all these things God will bring thee into judgment.

Ecclesiastes 12:13

Let us hear the conclusion of the whole matter: Fear God, and keep his commandments: for this is the whole duty of man.