(a) Jamil bin Zayd (may Allah have mercy on him) said: I saw Sayyiduna Ibn Umar (may Allah be pleased with them both) stoning with pebbles like goat droppings.
(b) It is narrated from Sayyiduna Ibn Umar (may Allah be pleased with them both) that, disliking to dismount, he used to take his pebbles from Muzdalifah itself.
(c) Imam al-Shafi'i (may Allah have mercy on him) said: He took them, but wherever one takes them from, they will suffice him; however, I dislike taking pebbles from the mosque, lest all the pebbles of the mosque be taken out, and from a garden or latrine and the like, because they are impure, and from the Jamrah itself, because those are pebbles that were not accepted.
(d) The Shaykh (may Allah have mercy on him) said: We have already narrated in the Book of Prayer, from Abu Salih (may Allah have mercy on him) through Sayyiduna Abu Hurayrah (may Allah be pleased with him), a marfu' report that "a pebble beseeches the man who takes it out of the mosque."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحج / 9542