פירוש על ויקרא 1:11

על ירך המזבח means ON THE SIDE OF THE ALTAR (cf. Rashi on Exodus 40:22).

On the side. The side is called “thigh” because the thigh is on the side; similarly (Shemos 26:22): “ולירכתי המשכן (For the end of the mishkon),” (Ibid. 27): “לירכתים ימה (of the western [back] wall)” — [means] the side.