Deuteronomy 11:14

The first rain ; the rain which falls from the middle of October to the end of December, which prepares the soil for the seed, and keeps it moist after the seed is sown. The latter rain ; that which falls in March and April, about the time when the grain is ripening for harvest; during the time of harvest no rain falls in Palestine. But if they allowed themselves to be deceived and misled, so as to apostatize from the Lord and serve other gods and worship them, the Divine displeasure would be shown in the withholding from them of the blessing, so that they should miserably perish.