The correct view is that combining the prayers is permissible for a traveller. For one who is travelling onward, it is recommended; for one who is staying in a place, it is permissible but not recommended. If he combines them, there is nothing wrong with it, but if he does not, that is better.
“And for a sick person for whom not combining them entails hardship; and between the two night prayers because of rain that soaks one’s clothes, mud, or a severely cold wind, …”
His statement, “And for a sick person for whom not combining them entails hardship,” means that it is permissible for a sick person to combine the prayers when leaving them uncombined would cause him hardship—that is, fatigue and exhaustion—whatever his illness may be, whether it is a headache, pain in the back, abdomen, or skin, or anything else. The evidence for this is as follows:
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The general import of Allah’s saying: “Allah intends for you ease and does not intend for you hardship” [al-Baqarah 2:185], and His saying: “He has not placed upon you in the religion any hardship” [al-Hajj 22:78].
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The hadith of Ibn Abbas, may Allah be pleased with him: “The Prophet, peace and blessings be upon him, combined the noon and afternoon prayers, and the sunset and night prayers, in Medina without fear or rain.” (1) They said: Since fear and rain were absent, and this occurred in Medina, travel too was absent. Thus, nothing remains except illness—though there may have been an excuse other than illness. However, Ibn Abbas was asked, “Why did he do that?” He replied, “He wanted not to cause hardship to his ummah.” That is, he did not want them to face hardship by not combining the prayers. From this we understand that whenever a legally accountable person would face hardship by not combining the prayers, it is permissible for him to combine them. This is why the author said, “And for a sick person for whom not combining them entails hardship.”
It is understood from the author’s statement that if no hardship would result, then it is not permissible for him to combine them—and that is indeed the case.