The Mishnah in Avot [1’ 3’] declares “Do not serve G-d for the sake of reward”. This is codified in the Rambam [Laws of Repentance, Chapt. 10. Halachah 1.]:
“…A person should not say: “I will fulfill the mitzvot of the Torah and occupy…

The Mishnah in Avot [1’ 3’] declares “Do not serve G-d for the sake of reward”. This is codified in the Rambam [Laws of Repentance, Chapt. 10. Halachah 1.]:
“…A person should not say: “I will fulfill the mitzvot of the Torah and occupy…