1 Samuel 12:17

Overview - 1 Samuel 12
Samuel testifies his integrity.
He reproves the people of ingratitude.
16 He terrifies them with thunder in harvest time.
20 he comforts them in God's mercy.
Treasury of Scripture Knowledge

1 Samuel 12:17  (King James Version)
Is it not wheat harvest to day? I will call unto the LORD, and he shall send thunder and rain; that ye may perceive and see that your wickedness is great, which ye have done in the sight of the LORD, in asking you a king.

Is it
In northern latitudes, thunder and rain are far from being un-common during harvest. But rain is hardly ever known in Palestine during that season, which commences about the end of June, or beginning of July. This fact is abundantly confirmed by modern travellers, and is demonstrative to every unprejudiced reader of the Holy Scriptures, that the thunder and rain, which at Samuel's invocation, was sent at this season of the year, was a miraculous interposition of the power of God; for we read in ver. 16, it was a "great thing which the Lord will do." Thus were the Israelites warned of their sin in having asked a king, and of the omnipotence of that God, whose gracious promises they virtually neglected by this act.
Proverbs 26:1

I will call
1 Samuel 7:9 1 Samuel 7:10 Joshua 10:12 ; Psalms 99:6 ; Jeremiah 15:1 ; James 5:16-18

your wickedness