Psalm 55:20 New English Translation

²⁰He^[a] attacks^[b] his friends;^[c]
he breaks his solemn promises to them.^[d]

Psalm 55:20 sn He. This must refer to the psalmist’s former friend, who was addressed previously in vv. 12-14.
Psalm 55:20 tn Heb “stretches out his hand against.”
Psalm 55:20 tc The form should probably be emended to an active participle (שֹׁלְמָיו, shol^emayv) from the verbal root שָׁלַם (shalam, “be in a covenant of peace with”). Perhaps the translation “his friends” suggests too intimate a relationship. Another option is to translate, “he attacks those who made agreements with him.”
Psalm 55:20 tn Heb “he violates his covenant.”

New English Translation (NET)