Translation:

31. Behold there were brought before him at eventide coursers of the highest breeding; and swift of foot;

Notes (Tafseer)

4183. The passages about David and Solomon have been variously interpreted by the Commentators. The versions which I have suggested have good authority behind them, though I have followed my own judgment in filling in the details.

4184. Safinat: literally, horses that stand, when at ease, on three legs, firmly planted, with the hoof of the fourth leg resting lightly on the ground. This would imply breeding and a steady temper, to match with their quality of swiftness mentioned in the next clause.