“No one who prays before the rising of the sun and before its setting will enter the Fire.”
That is, the Fajr (dawn) and ʿAsr (afternoon) prayers.

Narrated by Muslim (no. 634), from the hadith of ʿUmārah ibn Ru’aybah (may Allah be pleased with him).

Brief Explanation of the Hadith

Prayer holds an exalted status and immense importance in Islam. Great virtue and immense reward have been promised to those who observe it consistently. And among such virtues is this ḥadīth, which states that none who performs prayer before sunrise—meaning the Fajr prayer—and before sunset—meaning the ʿAṣr prayer—will enter the Fire. Hence, observe them regularly and maintain consistency in performing these two prayers.
Scholars have understood this ḥadīth to signify the negation of entering Hell either:
– absolutely, meaning he will not enter it at all, or
– in permanence, meaning he may enter it temporarily for sins, but will not abide therein eternally.
Or it may be said that the ḥadīth is to be understood in light of what is most common—that those who perform and give due care to these two prayers are, in the majority of cases, mindful of what would otherwise lead them to the Fire.
The mention of these two particular prayers—Fajr and ʿAṣr—is due to their immense virtue, and as an encouragement to perform them diligently. They occur at two witnessed times, attended by the angels of the night and the angels of the day, during which the deeds of the servants are raised to Allah, may He be exalted. Moreover, these two times are particularly challenging to maintain: Fajr falls during the comfort of sleep, while ʿAṣr comes at a time of worldly preoccupation—when trade is active and buying and selling are in full motion. Only those whom Allah intends good for—those of strong faith and sound religion—are granted success in consistently observing them. And whoever is diligent in these two prayers will be even more mindful of the others.