Sahl bin Sa'd (may Allah be pleased with him) said: After he had lost his sight, Abu Usayd al-Sa'idi (may Allah be pleased with him) said to me: "O my nephew! If you and I were at Badr now, and Allah then restored my sight to me, I would show you the mountain pass from which the angels came down upon us, without any doubt or uncertainty."
Hadith Referenceالمعجم الكبير للطبراني / باب الميم / 16627