2. Muhammad ibn Yahya has narrated from Ahmad ibn Muhammad from Muhammad ibn ’Isma‘il from Muhammad af-Fudayi from abu af-Sabbah ai-Kinaniy who has narrated the foffowing: “I once asked abu ‘Abd Allah , about the case of a man who says that there is a vow, a commitment on him (the Imam) said, ‘It does not have any valid effect until one specifies it, like fasting, charity, a gift or al-Hajj.’”