Why do we use left feet to enter washroom?

Question

Did we have washrooms/toilets 1400 years ago in Arabia?

If not, how is this sunnah applicable for open air defecation?

Answer 1

There is no particular evidence for this sunnah excatly! but scholars agree that we should enter the bathroom by left foot, and the there're two evidences for this:

1. there's a main rule that say: we should use the right as general for all good things, and use left for other.

قَالَ حَدَّثَتْنِي حَفْصَةُ، زَوْجُ النَّبِيِّ صلى الله عليه وسلم أَنَّ النَّبِيَّ صلى الله عليه وسلم كَانَ يَجْعَلُ يَمِينَهُ لِطَعَامِهِ وَشَرَابِهِ وَثِيَابِهِ وَيَجْعَلُ شِمَالَهُ لِمَا سِوَى ذَلِكَ ‏.‏

The Prophet (ﷺ) used his right hand for taking his food and drink and used his left hand for other purposes.

2. by Qiyas, so from the sunnah using right foot to entering the mosque and left one to get out of it, so it's a reverse qiyas.