Isaiah 62:6 in the King James Version
I have set watchmen upon thy walls, O Jerusalem, which shall never hold their peace day nor night: ye that make mention of the LORD, keep not silence,
Context
5 For as a young man marries a virgin, so your sons will marry you. As a bridegroom rejoices over his bride, so your God will rejoice over you.
6 I have set watchmen on your walls, Jerusalem. They will never be silent day nor night. You who call on the LORD, take no rest,
7 and give him no rest until he establishes, and until he makes Jerusalem a praise on the earth.