الكافي 1/4/70/8

8. Ali ibn Ibrahim has narrated from Muhammad ibn ‘Isa from Yunus ibn ‘Abd al-Rahman from ‘Abd al-A‘la from abu ‘Abdallah عليه السلام who has said the following. “My father entrusted me with all that is there (the sacred objects inherited from the prophets such as directive wills etc.). When he was about to leave this world, he asked me to call for him a few people to bear testimony. I then called for him four people from Quraysh among them was Nafi‘ Mawla ‘Abdallah ibn ‘Umar. He then said, “Write down: This is (like) what was the directive will of Jacob to his sons, “My sons, God has chosen this religion for you. You must not leave this world unless you are a Muslim (submitted to the will of the Lord of the Universe).” (2:132) . Muhammad ibn Ali has recommended Ja‘far ibn Muhammad in his directive will and commands him to shroud him with his gown with which he would [erform his prayers on Fridays and prepare a turban for him out of his own turban. That he should shape his grave squirely and raise it four inches from the ground and open the knots of from all ends of his shroud when it is to bury him. Then he said to the testimony bearers, “You may go now, may Allah bless you.” I then asked him after they had left, “O father, you did not need to make a will for such matters.” He said, “My son, I did not like when you will be over come they would say, “No directive will was made in his favor.” I just wanted to establish a defence authority in your favor.”