Hebrew Bible

Leviticus 21:5

3 and his virgin sister who is near to him, who has no husband—he may defile himself for her. 4 He must not defile himself as a husband among his people so as to profane himself. 5 Priests must not have a bald spot shaved on their head, they must not shave the corner of their beard, and they must not cut slashes in their body. 6 “‘They must be holy to their God, and they must not profane the name of their God, because they are the ones who present the Lord’s gifts, the food of their God. Therefore they must be holy. 7 They must not take a wife defiled by prostitution, nor are they to take a wife divorced from her husband, for the priest is holy to his God.

Date: 5th Century B.C.E. (Final composition)
* Dates are based on scholarly estimates
Hebrew Bible

Ezekiel 44:20

18 Linen turbans will be on their heads and linen undergarments will be around their waists; they must not bind themselves with anything that causes sweat. 19 When they go out to the outer court to the people, they must remove the garments they were ministering in and place them in the holy chambers; they must put on other garments so that they will not transmit holiness to the people with their garments. 20 “‘They must not shave their heads nor let their hair grow long; they must only trim their heads. 21 No priest may drink wine when he enters the inner court. 22 They must not marry a widow or a divorcee, but they may marry a virgin from the house of Israel or a widow who is a priest’s widow.

Date: 6th Century B.C.E.
* Dates are based on scholarly estimates