Do not do deeds for anyone but Allaah

And most of them believe not in Allah except while they associate others with Him.

[Qur'aan 12: 106]

Abu Hurairah (may Allaah be pleased with him) said:

The Messenger of Allah (sallallaahu alayhi wa sallam) said, "Almighty Allah says, 'I am the One Who is most free from want of partners. He who does a thing for the sake of someone else beside Me, I discard him and his polytheism."

[Sahih Muslim]

Ibn Abbaas said (regarding the above mentioned Verse): It was their Imaan that when they were asked: Who created the Heavens and Who created the Earth and Who created the mountains, they would reply: Allaah while they were polytheists.

Mujaahid said: Their Imaan was their saying that Allaah created us, feeds us, and causes us to die.