In this, Az-Zubair (may Allah be pleased with him) narrated from the Prophet (peace and blessings of Allah be upon him).

Narrated `Ali: I never heard Allah's Apostle saying, "Let my father and mother be sacrificed for you," except for Sa`d (bin Abi Waqqas). I heard him saying, "Throw! (arrows), Let my father and mother be sacrificed for you!" (The sub-narrator added, "I think that was in the battle of Uhud.")