Translation:

251. By Allah's will they routed them: and David slew Goliath; and Allah gave him power and wisdom and taught him whatever (else) He willed. And did not Allah check one set of people by means of another the earth would indeed be full of mischief but Allah is full of bounty to all the worlds.

Notes (Tafseer)

283. Carried by angels: these words refer to the Tabut or Ark, the cherubims with outstretched wings on the lid may well be supposed to carry the security or peace which the Ark symbolised.

286. Note how the whole story is compressed into a few words as regards narration, but its spiritual lessons are dwelt upon from many points of view. The Old Testament is mainly interested in the narrative, which is full of detail, but says little about the universal truths of which every true story is a parable. The Qur-an assumes the story, but tells the parable.

287. David was not only a shepherd, a warrior, a king, a wise man, and a prophet, but was also endowed with the gifts of poetry and music. His Psalms (sabur) are still extant.