Belief

Allah will not leave the believers as they are without distinguishing the wicked from the righteous. Nor will He reveal the unseen to you, but He chooses messengers for this knowledge as He wills. So believe in Allah and His messengers

3:179It is not (the purpose) of Allah to leave you in your present state till He shall separate the wicked from the good. And it is not (the purpose of) Allah to let you know the Unseen. But Allah chooseth of His messengers whom He will, (to receive knowledge thereof). So believe in Allah and His messengers. If ye believe and ward off (evil), yours will be a vast reward.

We revealed the Torah, containing guidance and light. The prophets who submitted to Allah judged by it, as did the rabbis and scholars, entrusted to uphold Allah’s Book.

5:44Lo! We did reveal the Torah, wherein is guidance and a light, by which the prophets who surrendered (unto Allah) judged the Jews, and the rabbis and the priests (judged) by such of Allah's Scripture as they were bidden to observe, and thereunto were they witnesses. So fear not mankind, but fear Me. And My revelations for a little gain. Whoso judgeth not by that which Allah hath revealed: such are disbelievers.

True righteousness is in one who believes in the prophets

2:177It is not righteousness that ye turn your faces to the East and the West; but righteous is he who believeth in Allah and the Last Day and the angels and the Scripture and the prophets; and giveth wealth, for love of Him, to kinsfolk and to orphans and the needy and the wayfarer and to those who ask, and to set slaves free; and observeth proper worship and payeth the poor-due. And those who keep their treaty when they make one, and the patient in tribulation and adversity and time of stress. Such are they who are sincere. Such are the Allah-fearing.