"Ibn Abbas was asked about a man who fasted during the day and stood (in prayers) during the night, but he did not attend the Friday prayer nor congregational prayer. He replied: 'He is in the Fire.'"
Jami` at-Tirmidhi Book 2, Hadith 70
← Previous Hadith the Prophet said: "I was about to order my boys to collect bundles of firewood, then order Salat to be held, then burn (the homes) of the people who did not attend the Salat."

Jami` at-Tirmidhi Book 2, Hadith 69 Next Hadith → "I attended Hajj with the Prophet. I prayed the Subh (Fajr) prayer with him in Masjid AI-Khaif." He said: "When the Prophet finished, he turned (from the Qiblah) and saw two men at the back of the people who had not prayed with him. He said, 'Bring them to me.' So I brought then while they were shuddering with fear. He said: 'What prevented you from praying with us?" They said: 'O Messenger of Allah!' We prayed at our camp.' So he said: 'Do not do that; when you pray in your camp then you come to a Masjid with a congregation, then pray with them. That will be a voluntary prayer for you.'"

Jami` at-Tirmidhi Book 2, Hadith 71