Praise be to Allaah.
It is Sunnah when wiping the khuffayn to wipe both of them
together, but that is not obligatory.
Some scholars are of the view that the right foot should be
done first, but the correct view is the first one mentioned.
Al-Mardaawi said in al-Insaaf (1/185): The Sunnah way
of wiping (over the khuffayn) is to put the hands with the fingers outspread
on the toes, then draw the hands up towards the shins once on the right and
left feet. It says in al-Talkhees wal-Bùlghah: It is Sunnah to
give precedence to the right foot. Al-Bayhaqi narrated that the Prophet
(blessings and peace of Allah be upon him) wiped over his khuffayn in one
go, “it is as if I can see his fingers on the khuffaayn.” The apparent
meaning of this is that he did not give precedence to one of them over the
other. But however one wipes them it is acceptable. End quote.
From the words “however one wipes them it is acceptable” it
may be understood that what you mention about wiping the right foot first
and then the left does not matter; rather it is only different from what is
preferable if one is able to do it.
Shaykh Ibn ‘Uthaymeen (may Allah have mercy on him) said: …
i.e., what should be wiped is the top of the khuff, so he should pass his
hand from the toes up to the shin only, and the wiping should be done with
both hands on both feet at the same time, i.e., the right hand should wipe
the right foot and the left hand should wipe the left foot at the same time,
as the ears are wiped, because this is the apparent meaning of the Sunnah.
Al-Mugheerah ibn Shu‘bah (may Allah be pleased with him) said: Then he wiped
over them, and he did not say that he started with the right foot, rather he
said that he wiped over them. So this is the apparent meaning of the Sunnah.
Yes, if we assume that if he cannot use one of his hands, then he should
start with the right foot before the left foot. But many people wipe with
both hands on the right foot and both hands on the left foot; there is no
basis for this as far as I know. … But however one wipes the top of the
khuff is acceptable, but what we are talking about here is what is
End quote from Fataawa al-Mar’ah al-Muslimah, 1/250
It does not matter either if one wipes the right foot with
the left hand, but the Sunnah is to wipe the right foot with the right hand
and the left foot with the left hand, unless there is something wrong with
one of the hands that means it cannot be used.
It says in Kashshaaf al-Qinaa‘ (1/119): It is Sunnah
to wipe the right foot with the right hand and the left foot with the left
hand, because of the hadeeth of al-Mugheerah quoted above. End quote.
And Allah knows best.