Walk through Amos, verse by verse, with the great Bible Commentaries of Matthew Henry (1662 - 1714) & Adam Clarke (1760 - 1832)
4:7
And also I have withholden the rain from you, when there were yet three months to the harvest: and I caused it to rain upon one city, and caused it not to rain upon another city: one piece was rained upon, and the piece whereupon it rained not withered.
KJV
{Also I forbad rain from you, when three months were yet to coming, till to ripe corn; and I rained on
one city, and on another city I rained not; one part was berained, and the part dried up on (that) which I rained not.} Wycliffe's Bible
When there were yet three months to the harvest - St. Jerome says, from the end of April, when the latter rain falls, until harvest, there are three months, May, June, and July, in which no rain falls in Judea. The rain, therefore, that God had withheld from them, was that which was usual in the spring months, particularly in April.
I caused it to rain upon one city - To prove to them that this rain did not come fortuitously or of necessity, God was pleased to make these most evident distinctions. One city had rain and could fill all its tanks or cisterns, while a neighboring city had none.
I caused it to rain upon one city - To prove to them that this rain did not come fortuitously or of necessity, God was pleased to make these most evident distinctions. One city had rain and could fill all its tanks or cisterns, while a neighboring city had none.