All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad, sallallaahu ‘alayhi wa sallam, is His Slave and Messenger.
The majority of scholars set the condition that the proxy should start to throw for himself first and then throw for the one who authorized him, but they differed after that on the following:
Is it a condition that he throws the three pebbles for himself first and then goes back to throw them on behalf of the principal, or does it avail him to throw the first pebble for himself and then for the principal and then repeat the process with the second and the third?
We give preponderance to the second opinion. It is the opinion adopted by the Maaliki school of jurisprudence and one of the two opinions of the Shaafi‘is.
It is given preponderance because of two matters:
First: those who adopted the first opinion prohibited throwing on behalf of the principal because if one throws a pebble on behalf of another without having thrown for himself, then the throwing is regarded as for himself, not for the one who authorized him. However, this does not apply to the opinion we chose because he will throw – on behalf of the principal – a pebble which he has already thrown for himself.
Second: this is easier due to the intense crowding at the throwing of the pebbles. Allaah Almighty says (what means): {He has chosen you and has not placed upon you in the religion any difficulty.} [Quran 22: 78]
Allaah Knows best.