Leviticus 9:22-23

Webster_Strongs⁽ⁱ⁾

22 H175 And Aaron H5375 [H8799] lifted up H3027 his hand H5971 toward the people H1288 [H8762] , and blessed H3381 [H8799] them, and came down H6213 [H8800] from offering H2403 the sin offering H5930 , and the burnt offering H8002 , and peace offerings.

23 H4872 And Moses H175 and Aaron H935 [H8799] went H168 into the tabernacle H4150 of the congregation H3318 [H8799] , and came out H1288 [H8762] , and blessed H5971 the people H3519 : and the glory H3068 of the LORD H7200 [H8735] appeared H5971 to all the people.

Online Parallel Study Bible

his hand. or, as the Greek has it, "his hands."Menachem gives reason why it is written hand, to signify the right hand, because that was lifted up higher than the left. The lifting up of the hand was a gesture used in speaking, and signifying any weighty thing, Isa 49:22; and particularly in swearing, Ge 14:22; praying, Ps 28:2; and blessing, either of God, Ps 134:2, or of men, as in this place. Paul, speaking of prayer, uses the phrase, "lifting up holy hands;" as also David: "Let the lifting up of my hands be as the evening sacrifice."
Genesis 14:18-20; Numbers 6:23-27; Deuteronomy 10:8; Deuteronomy 21:5; 1 Kings 8:55; 1 Chronicles 23:13
2 Chronicles 6:3; Psalms 72:17; Mark 10:16; Luke 24:50; Acts 3:26; 2 Corinthians 13:14
Hebrews 7:6; Hebrews 7:7; 1 Peter 3:9