Translation:

107. And We ransomed him with a momentous sacrifice:

Notes (Tafseer)

4103. The adjective qualifying "sacrifice" here, 'azim, (great, momentous) may be understood both in a literal and a figurative sense. In a literal sense it implies that a fine sheep or ram was substituted. The figurative sense is even more important. It was indeed a great and momentous occasion, when two men, with concerted will, "ranged themselves in the ranks" of those to whom self-sacrifice in the service of Allah was the supreme thing in life.