The SHORT form of the divine name, one syllable rather than the full four consonants of YHVH — the form behind HALLELU-YAH, 'praise Yah.' ⚠ Its first appearance anywhere in the Hebrew Bible is Exodus 15:2, in the Song of the Sea ('my strength and song is Yah'), a line two later poets quote back word for word: Isaiah 12:2 and Psalm 118:14 both open the identical phrase. Usage is concentrated in poetry, especially the Hallel psalms (113-118, 146-150), where 'praise Yah' becomes the refrain. → first discussed at Exod 15:2