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O ye who believe, seek the help of Allah through patience, steadfastness and Prayer; surely Allah is with the steadfast. (Holy Quran, 2:154)

We will surely try you with somewhat of fear and hunger, and loss of wealth and lives and fruits; but give glad tidings to the patient and steadfast. (2:156)

O ye who believe, be steadfast and strive to excel in steadfastness. (3:201)

Verily, the steadfast shall have their reward without measure. (39:11)

Suhaib ibn Sinan^ra relates that the Holy Prophet Muhammad^sa said: Wondrous is the case of a believer; there is good for him in everything, and it is so for him alone. If he experiences something agreeable, he is grateful to God and that is good for him; and if he experiences adversity, he is steadfast and that is good for him. (Muslim)

Abu Hurairah^ra relates that the Holy Prophet Muhammad^sa said: Allah, the Exalted, says: I have no reward other than Paradise for a believing servant of mine who is steadfast when I take away a beloved one of his from among the denizens of the world. (Bukhari)

Anas^ra relates that the Holy Prophet Muhammad^sa passed by a woman who was crying over a grave. He said to her: Be mindful of thy duty to Allah and be steadfast. She retorted: Leave me alone; you have not been afflicted as I have been. She had not known who he was. Someone told her: That was the Holy Prophet Muhammad^sa. She proceeded to the door of the Holy Prophet and not finding any doorman went in and said to him: I had not recognised you. He said: Steadfastness means to be resigned at the time of the first shock of grief. (Bukhari and Muslim)