וַיֹּ֧סֶף ע֣וֹד אַבְנֵ֗ר לֵאמֹר֙ אֶל־עֲשָׂהאֵ֔ל ס֥וּר לְךָ֖ מֵאַֽחֲרָ֑י לָ֤מָּה אַכֶּ֙כָּה֙ אַ֔רְצָה וְאֵיךְ֙ אֶשָּׂ֣א פָנַ֔י אֶל־יוֹאָ֖ב אָחִֽיךָ׃
And Abner said again to Asahel: ‘Turn thee aside from following me; wherefore should I smite thee to the ground? how then should I hold up my face to Joab thy brother?’
Chizkuni
ישא ה׳ פניו אליך, “may the Lord lift up His countenance upon you!” In order to understand this properly it will help to look at Samuel II 2,22: ואיך אשא פני אל יואב אחיך “ how will I be able to look your brother Yoav in the face? [Avner had been trying to save Asa-el, his pursuer’s life, and Yoav’s brother by begging him to take advantage of the opportunity to escape from him. Ed.] The priests, in their blessing, ask G-d to welcome the members of the congregation with a welcoming and joyful heart.