Some pilgrims start collecting pebbles to
throw at the Stone Pillars in Mina as soon as they arrive in
Muzdalifah prior to praying the Maghrib and 'lsha prayers.
This is not correct. Nor is the practice that all the
pebbles must be collected at Muzdalifah.
The correct position is that the pebbles can be collected
anywhere within the boundaries of al-Haram (the territory of
Makkah ).
It is known that the Prophet (peace be on him) did not ask
that the pebbles for Jamratul Aqabah be picked up for him
from Muzdalifa. They were picked up for him, in the Morning,
after leaving Muzdalifa and on entering Mina. The rest of
the pebbles were picked up for him, from Mina too.
Some pilgrims wash the pebbles, but this is not recommended.