Volume 5, Book 57, Number 59:
Narrated Anas:
Whenever there was drought, ‘Umar bin Al-Khattab used to ask Allah for rain through Al’Abbas
bin ‘Abdul Muttalib, saying, “O Allah! We used to request our Prophet to ask You for rain, and You
would give us. Now we request the uncle of our Prophet to ask You for rain, so give us rain.” And
they would be given rain.”