The Prophet (s.a.) was bestowed with a miracle resembling the illuminated hand. It was a thousand times better and superior to it because whenever His Eminence (S) wanted to meet Hasan and Husain (a.s.) at night and they were at home, His Eminence (S) used to call out: O Aba Muhammad and O Aba Abdullah, come to me.
In spite of the distance, they could hear the voice of the Prophet and at once they came out to join His Eminence (S). At that time the Prophet used to point out with his forefinger from the door and a light more powerful than that of the moon and the sun used to spread in the atmosphere and both chiefs of the youths of Paradise reached their grandfather. After that the finger returned to its original condition.
When they finished talking, they were given permission to go home. Again the Prophet took out his index finger out of the door and a light more powerful than the sun and moon used to spread and both the infallibles returned home in that light, after which the finger returned to its original condition.
Reference:Hayat Al-Qulub Vol. 2