Parallel
1 Samuel 20:17
Rahlfs Septuagint (1935) · Berean Standard Bible
καὶ προσέθετο ἔτι Ιωναθαν ὀμόσαι τῷ Δαυιδ ὅτι ἠγάπησεν ψυχὴν ἀγαπῶντος αὐτόν
And Jonathan had David reaffirm his vow out of love for him, for Jonathan loved David as he loved himself.