Surely those who disbelieve in Allah and His messengers and (those who) desire to make a distinction between Allah and His messengers and say: We believe in some and disbelieve in others, and desire to take a course between (this and) that.

And certainly Allah made a covenant with the children of Israel, and We raised up among them twelve chieftains; and Allah said: Surely I am with you; if you keep up prayer and pay the poor-rate and believe in My messengers and assist them and offer to Allah a goodly gift, I will most certainly cover your evil deeds, and I will most certainly cause you to enter into gardens beneath which rivers flow, but whoever disbelieves from among you after that, he indeed shall lose the right way.

And know that whatever thing you gain, a fifth of it is for Allah and for the Messenger and for the near of kin and the orphans and the needy and the wayfarer, if you believe in Allah and in that which We revealed to Our servant, on the day of distinction, the day on which the two parties met; and Allah has power over all things.

The believers are only those who believe in Allah and His Messenger then they doubt not and struggle hard with their wealth and their lives in the way of Allah; they are the truthful ones.

O you who believe! do not take My enemy and your enemy for friends: would you offer them love while they deny what has come to you of the truth, driving out the Messenger and yourselves because you believe in Allah, your Lord? If you go forth struggling hard in My path and seeking My pleasure, would you manifest love to them? And I know what you conceal and what you manifest; and whoever of you does this, he indeed has gone astray from the straight path.

You shall believe in Allah and His Messenger, and struggle hard in Allah's way with your property and your lives; that is better for you, did you but know!