The ruling on stoning with the Pebbles that are around the Pillars
Question:
Is it permissible for the Hajj pilgrim to stone using the pebbles that are around the pillars?
Answer:
That is permissible for him, because the basic principle (i.e. assumption) is that it has not been used for stoning. However, concerning those stones that are in the basin (at the foot of the pillar), none of them should be used for stoning.
Source :
Shaykh `Abdul-`Azeez Bin Baz
Fatawa Islamiyah, vol.4, p.238, DARUSSALAM