Exodus 32:26-29

32:26 So Moses stood at the entrance of the camp and said, “Whoever is for the Lord, come to me.” All the Levites gathered around him, 32:27 and he said to them, “Thus says the Lord, the God of Israel, ‘Each man fasten his sword on his side, and go back and forth from entrance to entrance throughout the camp, and each one kill his brother, his friend, and his neighbor.’”

32:28 The Levites did what Moses ordered, and that day about three thousand men of the people died. 32:29 Moses said, “You have been consecrated today for the Lord, for each of you was against his son or against his brother, so he has given a blessing to you today.”

Deuteronomy 33:8-11

Blessing on Levi

33:8 Of Levi he said:

Your Thummim and Urim belong to your godly one,

whose authority you challenged at Massah,

and with whom you argued at the waters of Meribah.

33:9 He said to his father and mother, “I have not seen him,”

and he did not acknowledge his own brothers

or know his own children,

for they kept your word,

and guarded your covenant.

33:10 They will teach Jacob your ordinances

and Israel your law;

they will offer incense as a pleasant odor,

and a whole offering on your altar.

33:11 Bless, O Lord, his goods,

and be pleased with his efforts;

undercut the legs of any who attack him,

and of those who hate him, so that they cannot stand.