Parallel
Psalms 54:21
Rahlfs Septuagint (1935) · Berean Standard Bible
ἐξέτεινεν τὴν χεῖρα αὐτοῦ ἐν τῷ ἀποδιδόναι ἐβεβήλωσαν τὴν διαθήκην αὐτοῦ
55:20
My companion attacks his friends; he violates his covenant.