مناسك حج - مكارم شيرازى، ناصر - الصفحة ١٧٠ - Rulings of Wuquf in Arafat and Mash'ar

١- Having the intention of closeness to Allah, and it is enough to have the intention in the heart that he/ she has the intention of throwing seven pebbles to Jamarah for obeying Allah and performing rituals of Hajj and it is not necessary to say this intention by words.

٢- The pilgrim should use seven pebbles( not being very large and not being very small, it is enough that each of them to be in size of a finger nail ).

٣- Pebbles should be hurled one by one and throwing two pebbles together is considered is throwing only one.

٤- Pebbles should strike Jamarah and if there is a doubt in this matter, it is not enough and the act should be performed again. ١

١- According to lots of great scholars and scientist of literature, Jamarah means

مجتمع الحصي‌

which means the place of collection of pebbles or according to the owner of Jawahir Jamarah is the place of Jimar( pebbles )and it is understood from several cabbalas that Jamarah is the same land which pebbles are thrown to that and it seems that pillar are placed there as signs, therefore it is not necessary the respected Hajjis trouble themselves to throw the pebbles to pillars, but it is enough to throw the pebbles to the circle around the pillar and it is enough if pebbles strike the pillar and fall at the base; but bearing this hardness is not necessary and if they perform Ramy from the upper level, throwing the pebbles to the holes which are placed in upper level

and then pebbles fall of the ground from there is enough.