Al-Matalib al-'Aliyah 2939 — The fundamentals of the religion

It is narrated from Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) that a man put his foot on the neck of another man while he was in prostration. He (the one prostrating) said (in anger): "Have you put your foot on my neck while I am in prostration? By Allah! Allah will never forgive you." Then he said: "He swore an oath concerning Allah Almighty (that Allah would not forgive so-and-so), so Allah forgave him (the other man)."
Imam Musaddad recorded this hadith and all its narrators are thiqat (trustworthy).