Parallel
Psalms 54:21
Swete's Septuagint · 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.