Stoning the Jamaraat is one of the obligatory rituals of Hajj and is prescribed for everyone who intends to do this great pilgrimage. This ritual is mentioned clearly in the Sunnah and its authenticity is agreed upon by the scholars. 

It was narrated from Ibn ‘Abbaas (may Allaah be pleased with him) that the Prophet (blessings and peace of Allaah be upon him) seated al-Fadl behind him on his mount, and al-Fadl said that he did not stop reciting the Talbiyah until he stoned the Jamrah. 

Narrated by al-Bukhaari (1685) and Muslim (1282). 

It was narrated from ‘Abd-Allaah (may Allaah be pleased with him) that he came to the largest Jamrah and put the House on his left and Mina on his right and stoned it with seven (pebbles), and he said: This is how the one to whom Soorat al-Baqarah was revealed (blessings and peace of Allaah be upon him) stoned it. 

Narrated by al-Bukhaari (1748) and Muslim (1296) 

It was narrated from Ibn ‘Umar (may Allaah be pleased with him) that he would stone al-Jamrah al-Dunya (the Jamrah near the Khayf mosque) with seven pebbles, saying takbeer after every throw. Then he would go ahead until he reached the level ground where he would stand facing the qiblah, and he stood for a long time, offering du’aa’ and raising his hands. Then he would stone the middle pillar, then he would move to the left towards the middle ground, where he would stand facing the qiblah. He would remain there for a long time offering du’aa’ and raising his hands. Then he would stone Jamarat al-‘Aqabah from the middle of the valley, but he did not stand beside it. Then he would leave and say: This is how I saw the Prophet (blessings and peace of Allaah be upon him) doing it. 

Narrated by al-Bukhaari (1751). 

Ibn al-Mundhir (may Allaah be pleased with him) said: 

They were unanimously agreed that if a person stones the Jamaraat during the days of al-Tashreeq after the sun has passed the meridian, that is valid. 

Al-Ijmaa’ by Ibn al-Mundhir (11). 

Ibn Hazm (may Allaah be pleased with him) said: 

They agreed that the three days after the Day of Sacrifice are the days for stoning the Jamaraat, and that the one who stoned them during those days after the meridian, that is valid.  

Maraatib al-Ijmaa’ by Ibn Hazm (46). 

Ibn Qudaamah (may Allaah have mercy on him) said: 

When he reaches Mina, he should start with Jamarat al-‘Aqabah, which is the furthest of the Jamaraat from Mina and the closest of them to Makkah, and it is at al-‘Aqabah, hence it is also called Jamarat al-‘Aqabah. He should stone it with seven pebbles, saying takbeer with each throw. He should stand at the middle of the valley and turn to face the qiblah, then he should leave and should not stay there. This is a summary of the views of those scholars whose views we know. End quote.

Al-Mughni (3/218). 

Abu Haamid al-Ghazaali (may Allaah have mercy on him) said: 

As for the stoning of the Jamaraat, the purpose behind it is to follow the command and manifest submission and servitude to Allaah, and show complete obedience without rational thought or the ego having any part in it. The aim is also to imitate Ibraaheem (peace be upon him), when Iblees (may Allaah curse him) appeared to him in that place to instil confusion in his mind or tempt him to sin, and Allaah commanded him to throw stones at him so as to drive him away and dash his hopes. If you ever think that the shaytaan appeared to him and he saw him and that is why he stoned him, but as for me, the shaytaan did not appear to me, it should be noted that this thought is from the shaytaan and that he is the one who is putting it into your mind, so as to slow you down when you are throwing and you will imagine that it is an action in which there is nothing good and that it is like playing, so why should you bother with it? Expel him from your mind with a serious attitude and determination to throw the pebbles despite the shaytaan. Remember that you are outwardly throwing pebbles at al-‘Aqabah, but in fact you are throwing them in the face of the shaytaan and you are breaking his back with them, because nothing annoys him except your obeying the command of Allaah out of veneration for Him, simply because of His command, and the soul and mind have nothing to do with it. End quote. 

Ihya’ ‘Uloom al-Deen, 1/270 

And Allaah knows best.