Midrash for Job 36:32

R. Ami said: "Rains are withheld solely on account of the sin of robbery; as it is said (Job 36, 32) He covereth His hands with the lightning. His hands, refers to the robbery; as it is said (Jonah 3, 8) And from the violence which is in their hands; and light, refers to rain; as it is said (Job 37, 11) He spreadeth abroad the cloud of His lightning. What is its remedy? Increasing prayer; as it is said (Ib. 36, 32) And giveth it a charge B'mafgiah; and Mafgia refers to prayer; as it is said (Jer. 7, 16) Therefore pray not thou for this people, etc., neither Tifga, (shall thou make intercession to Me)."