It is narrated from Hazrat Abu Saeed Khudri (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) said: If any Muslim makes a supplication in which there is no aspect of sin or severing of family ties, Allah surely grants him one of three things: either his supplication is accepted immediately, or it is stored for him for the Hereafter, or a calamity similar to it is averted from him. The companions (may Allah be pleased with them) said: In that case, we will supplicate abundantly. The Prophet (peace and blessings be upon him) said: Allah is even more abundant.
Hadith Referenceمسند احمد / مسند المكثرين من الصحابة / 11133