The questioner says: if he puts on his socks and begins wiping over them while he is resident, what will happen if he then travels in this same day?
In this case, it is prescribed for him to continue wiping (for three days) just like a traveller, as he is now a traveller, and the Prophet ﷺ allowed the traveller to wipe over the socks for three days and three nights (i.e. 72 hours).
There’s a difference of opinion in this matter, but this is the strongest opinion.
In any case, it’s best to avoid the difference of opinion and stick to the safe side; in that he continues wiping over his socks for the remainder of the day. Although, it appears that after assuming the role of a traveller, he takes up the traveller’s concession; which runs for three days and three nights. The same way when a traveller becomes resident, he is reduced to the resident’s concession (i.e. 24 hours) according to the scholars; as he is now resident; so he would wipe for one day and one night only. For example, if he began wiping for half a day during his travels and then resides in a town (on the same day), he becomes a resident, hence his concession is reduced to that of a resident, meaning, he can only wipe for another day and night (i.e. 24 hours). According to the scholars, he is now a resident, so he can only wipe for one day and one night; not more than that. So same would apply in the first scenario; i.e. if he began wiping over his socks as a resident and then travels, he can continue wiping for three days and three nights just like the traveller.
However, if he is cautious and limits himself to one day and one night, then this is good.
And in the case where he begins travelling without having wiped over his socks, here there’s no issue; as he would only start wiping once he is a traveller. So according to both opinions, he can continue wiping over his socks for three days and three nights – there’s no difference in this case.
Shaykh Muhammad ibn Hizaam – may Allaah preserve him
Abu Ishaq Muhammad Ibn Ahmad Ba Alawi