Allah, the Exalted, says:
"No doubt! Verily, the Auliya' of Allah [i.e., those who believe in the Oneness of Allah and fear Allah much (abstain from all kinds of sins and evil deeds which He has forbidden), and love Allah much (perform all kinds of good deeds which He has ordained)], no fear shall come upon them nor shall they grieve. Those who believed (in the Oneness of Allah - Islamic Monotheism), and used to fear Allah much (by abstaining from evil deeds and sins and by doing righteous deeds). For them are glad tidings, in the life of the present world (i.e., through a righteous dream seen by the person himself or shown to others), and in the Hereafter. No change can there be in the Words of Allah. This is indeed the supreme success.'' (10: 62-64)
"Every time he (Zakariya) entered Al-Mihrab to (visit) her, he found her supplied with sustenance. He said: `O Maryam (Mary)! From where have you got this?' She said, `This is from Allah.' Verily, Allah provides sustenance to whom He wills, without limit.'' (3:37)
