Sahih Muslim (1). Thus, the sunnah is to recite these two surahs on one occasion and those two on another. However, if a person takes the circumstances of the people into consideration, then during cold winter days he should recite Surah al-A'la and Surah al-Ghashiyah, because the cold may cause people to need to leave frequently to relieve themselves. The same applies during days of intense heat: he should recite Surah al-A'la and Surah al-Ghashiyah, particularly if the mosque does not have adequate cooling, in order to make things easier for the people. This is because part of the Prophet’s guidance, peace and blessings be upon him, was that whenever he was given a choice between two matters, he chose the easier of them so long as it was not sinful (2).

The general principle of Islamic law is ease. Therefore, if we know that it is easier for the worshippers to recite Surah al-A'la and Surah al-Ghashiyah during periods of severe cold and summer heat, then it is preferable to recite them. As for days of moderate weather, he should recite these two surahs on some occasions and those two on others, lest the sunnah be neglected. Their appropriateness is clear: in Surah al-A'la, Allah commands exhortation, saying:

“Therefore remind, if the reminder benefits. He who fears Allah will take heed.” [al-A'la]

The imam has already reminded the people in the sermon, thereby drawing their attention to the fact that, if they are among those who fear Allah, they will take heed.

Surah al-Ghashiyah mentions the Day of Resurrection and people’s states on that Day. Allah, Exalted is He, says:

“Some faces that Day will be humbled, labouring and weary.” [al-Ghashiyah]

And He says:

“Other faces that Day will be joyful, well pleased with their striving.” [al-Ghashiyah]

It likewise contains a reminder:

“So remind them: you are only one who reminds. You are not a controller over them.” [al-Ghashiyah]