And Harun ibn Sa'id al-Ayli and Ahmad ibn Isa narrated to me; they said: Ibn Wahb narrated to us; Amr ibn al-Harith informed us, from Ubayd Allah ibn Abi Ja'far, from Muhammad ibn Ja'far ibn al-Zubayr, from Urwa, from Aisha — may God be pleased with her — that the Messenger of God, peace and blessings be upon him, said: "Whoever dies while owing a fast, his guardian should fast on his behalf."