Jeremiah 34:14

34:14 “Every seven years each of you must free any fellow Hebrews who have sold themselves to you. After they have served you for six years, you shall set them free.” But your ancestors did not obey me or pay any attention to me.

Jeremiah 52:25

52:25 From the city he took an official who was in charge of the soldiers, seven of the king’s advisers who were discovered in the city, an official army secretary who drafted citizens for military service, and sixty citizens who were discovered in the middle of the city.