The Case of One Who Vows to Fast a Certain Day or for Thanksgiving

6. Ali ibn Ibrahim has narrated from his father from al-Hassan ibn Mahbub from Khalid ibn Jarir from abu al-Rabi’ who has said the following: “I once asked abu ‘Abd Allah عليه السلام, about a man who has said, ‘It is from Allah upon me to fast a Hin (a certain amount of time) for thanksgiving.’ Abu ‘Abd Allah عليه السلام, said, ‘A similar case came to Ali عليه السلام, and he said, ‘Fast for six months; Allah, most Majestic, most Glorious, has said, ‘It gives its fruits kulla Hin by the permission of its Lord’, that is six months.’”