And who believe in what has been revealed to you, [O Muhammad], and what was revealed before you, and of the Hereafter they are certain [in faith].

Until there came to us the certainty."

And worship your Lord until there comes to you the certainty (death).

No! If you only knew with knowledge of certainty...

And [for] their saying, "Indeed, we have killed the Messiah, Jesus, the son of Mary, the messenger of Allah." And they did not kill him, nor did they crucify him; but [another] was made to resemble him to them. And indeed, those who differ over it are in doubt about it. They have no knowledge of it except the following of assumption. And they did not kill him, for certain.

But the hoopoe stayed not long and said, "I have encompassed [in knowledge] that which you have not encompassed, and I have come to you from Sheba with certain news.

[Moses] said, "The Lord of the heavens and earth and that between them, if you should be convinced."

And they rejected them, while their [inner] selves were convinced thereof, out of injustice and haughtiness. So see how was the end of the corrupters.

And We have not made the keepers of the Fire except angels. And We have not made their number except as a trial for those who disbelieve - that those who were given the Scripture will be convinced and those who have believed will increase in faith and those who were given the Scripture and the believers will not doubt and that those in whose hearts is hypocrisy and the disbelievers will say, "What does Allah intend by this as an example?" Thus does Allah leave astray whom He wills and guides whom He wills. And none knows the soldiers of your Lord except Him. And mention of the Fire is not but a reminder to humanity.

And when it was said, 'Indeed, the promise of Allah is truth and the Hour [is coming] - no doubt about it,' you said, 'We know not what is the Hour. We assume only assumption, and we are not convinced.' "