Job 1:4; Job 1:5

4 His sons used to hold feasts in their homes on their birthdays, and they would invite their three sisters to eat and drink with them.

5 When a period of feasting had run its course, Job would make arrangements for them to be purified. Early in the morning he would sacrifice a burnt offering for each of them, thinking, “Perhaps my children have sinned and cursed God in their hearts.” This was Job’s regular custom.