Abu Dawud Book 23, Hadith Number 3897.

Narated By Zaid b. Khalid al-Juhani : The Apostle of Allah (may peace be upon him) led us in the morning prayer at al-Hudaibiyyah after rain which had fallen during the night, and when he finished, he turned to the people and said: Do you know what your Lord has sail? They said: Allah and His Apostle know best. He said: This morning there were among my servants one who believes in me and one who disbelieves. The one who said: “We have been given rain by Allah’s grace and mercy” is the one who believes in me and disbelieves in the star ; but the one who said: “We have been given rain by such and such a rain star,” is the one who disbelieves in me and believes in the star.