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The expression bi'l-ashar is usually taken to mean "at the times before daybreak", or simply "before daybreak". This is in agreement with the Prophet's recommendation to his followers (forthcoming from several authentic Traditions) to devote the latter part of the night, and particularly the time shortly before dawn, to intensive prayer. But while the word sahar (also spelled sahr and suhr), of which ashar is the plural, undoubtedly denotes "the time before daybreak", it also signifies - in the spellings sahar and suhr - "the core of the heart", "the inner part of the heart", or simply "heart" (cf. Lisan al-'Arab; also Lane IV, 1316). It seems to me that in the context of the above Qur'an-verse - as well as of 51:18 - this latter rendering is preferable to the conventional one: for, although the value of praying before daybreak has undoubtedly been stressed by the Prophet, it is not very plausible that the Qur'an should have tied the prayer for forgiveness to a particular time of day.
Optional prayers before dawn are recommended and are more likely to be accepted.
Sabr (Sabirin) includes many shades of meaning: I have specified three here, viz., patience, firmness, and self-control. See ii. 45 and ii. 153 and notes thereon.
True servants of Allah are described in iii. 16 and 17. They have faith, humility, and hope (iii. 16); and they have certain virtues (iii. 17) viz., (1) patience, steadfastness, self-restraint, and all that goes under the full definition of Sabr; this shows a certain attitude of mind: (2) in all their dealings they are true and sincere as they are also in their promises and words; this marks them out in social conduct: (3) further, their spiritual worship is earnest and deep, an inner counterpart of their outward conduct; (4) their worship of Allah shows itself in their love of their fellow-men, for they are ready and liberal in charity: and (5) their self-discipline is so great that the first thing they do every morning is humbly to approach their God.