Narrated from Sayyidah Aisha (may Allah be pleased with her) that when the Prophet (peace and blessings be upon him) saw clouds, he would become (concerned), he would go inside, come out, and walk back and forth, and the color of his face would change. Then when rain would fall from the sky, his concern would be relieved. When Sayyidah Aisha (may Allah be pleased with her) inquired about the reason, the Prophet (peace and blessings be upon him) said: "How do I know, perhaps it is as Allah the Exalted has said: «فَلَمَّا رَأَوْهُ عَارِضًا مُسْتَقْبِلَ أَوْدِيَتِهِمْ» [الأحقاف: 24] Then when they saw a cloud coming towards their valleys..."

It is narrated from Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) that the Prophet (peace and blessings of Allah be upon him) said: "Evil omen is shirk, and each of us has apprehensions, but Allah Almighty removes it through reliance (tawakkul) upon Him."