Matthew 4:10

Then saith Jesus unto him, Avaunt Satan! for it is written, "Thou shalt worship the Lord thy God, and to him only thou pay divine adoration."

Luke 4:8

And Jesus answering him, said, Get thee behind me, Satan, for it is written, "Thou shalt worship the Lord thy God, and to him alone shalt thou pay divine honour."

Matthew 6:24

No man can serve two masters: for he will either hate the one, and love the other; or he will adhere to the one, and disregard the other. Ye cannot serve God and mammon.

Matthew 15:8

This people draweth nigh to me with their mouths, and honoureth me with the lips, but their heart is far distant from me.

John 4:24

God is a Spirit: and they who worship him, must worship him in spirit and in truth.

Treasury of Scripture Knowledge

Summary

And Samuel spake unto all the house of Israel, saying, If ye do return unto the LORD with all your hearts, then put away the strange gods and Ashtaroth from among you, and prepare your hearts unto the LORD, and serve him only: and he will deliver you out of the hand of the Philistines.

Bible References

Prepare

Matthew 15:8
This people draweth nigh to me with their mouths, and honoureth me with the lips, but their heart is far distant from me.
John 4:24
God is a Spirit: and they who worship him, must worship him in spirit and in truth.

Serve him

Matthew 4:10
Then saith Jesus unto him, Avaunt Satan! for it is written, "Thou shalt worship the Lord thy God, and to him only thou pay divine adoration."
Matthew 6:24
No man can serve two masters: for he will either hate the one, and love the other; or he will adhere to the one, and disregard the other. Ye cannot serve God and mammon.
Luke 4:8
And Jesus answering him, said, Get thee behind me, Satan, for it is written, "Thou shalt worship the Lord thy God, and to him alone shalt thou pay divine honour."