Uqbah bin Sam’an says, that we went along with the Imam and he took a short nap on the horse’s back. Then he woke up and uttered the words:
“Verily we are Allah’s and verily unto Him shall we return. Praise be to Allah, the Lord of the worlds.”
Then he repeated it twice or thrice. His son Ali bin Husayn (a.s.), who was riding a horse, came up to him and asked, “Why did you (suddenly) praise Allah and utter the words of “returning to Him”? Imam replied,
“O my dear son! Sleep overtook me, and I saw a rider come up to me from behind and said: These people are proceeding further, while death is advancing towards them. I perceived that they were our spirits informing us of our death.”
Ali bin Husayn said, “O dear father! May your Lord not bring forth evil! Are we not on the right”? Imam replied,
“Why not, by Him towards Whom all servants return.”
Then Ali said, “Then we do not fear, for we shall die on the right.” Imam said,
“May Allah reward you abundantly, the reward which is due from a father to his son.”
Reference : Nafasul Mahmoom – Shaikh abbas Qummi (r.a.)