Parallel
1 Samuel 20:17
Swete's Septuagint · Berean Standard Bible
καὶ προσέθετο ἔτι Ἰωναθὰν ὀμόσαι τῷ Δαυείδ, 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.