Sayyiduna Anas bin Malik (may Allah be pleased with him) narrates that while the Messenger of Allah (peace and blessings be upon him) was delivering the sermon, a man came, stepping over the necks of the people, until he sat down near the Prophet (peace and blessings be upon him). When the Messenger of Allah (peace and blessings be upon him) finished the prayer, he said: "O so-and-so, what prevented you from joining (us in) the Jumu'ah prayer?" He said: "O Messenger of Allah, I was only trying to place myself in the spot that you see." He (peace and blessings be upon him) said: "I saw you stepping over the necks of the Muslims and harming them. Whoever harms a Muslim has harmed me, and whoever harms me has harmed Allah."
Imam al-Tabarani (may Allah have mercy on him) said: "No one narrated this hadith from Sayyiduna Anas bin Malik (may Allah be pleased with him) except al-Qasim al-Ijli, and no one narrated it from al-Qasim except Musa bin Khalaf, and Sa'id bin Sulayman is alone in narrating it."
Hadith Referenceالمعجم الأوسط / باب السين / 3607
Hadith Takhrij«أخرجه الطبراني فى «الصغير» برقم: 468»