Charles Spurgeon Commentary Deuteronomy 6:13-15

"Thou shalt fear Jehovah thy God; and him shalt thou serve, and shalt swear by his name. Ye shall not go after other gods, of the gods of the peoples that are round about you; for Jehovah thy God in the midst of thee is a jealous God; lest the anger of Jehovah thy God be kindled against thee, and he destroy thee from off the face of the earth." — Deuteronomy 6:13-15 (ASV)

Thou shalt fear the LORD thy God, and serve him, and shalt swear by his name. Ye shall not go after other gods, of the gods of the people which are round about you; (for the LORD thy God is a jealous God among you) lest the anger of the Lord thy God be kindled against thee, and destroy thee from off the face of the earth.

Our God is a jealous God. One said to a Puritan, "Why be so precise?" and he replied, "Because I serve a precise God." God has done so much for us, in order to win our hearts, that he ought to have them altogether for himself. When he has them all, it is all too little; but to divide our heart is to grieve his Spirit, and sorely to vex him.

Thou shalt fear the LORD thy God, and serve him, and shalt swear by his name. Ye shall not go after other gods, of the gods of the people which are round about you: (For the LORD thy God is a jealous God among you)

He will have the heart all to himself. Two Gods he cannot endure. Of false gods, there may be many: of the true God there can be but one, and he is a jealous God.