THE VIRTUES OF JAMAAT
Allah says in the Holy Quran: Bow down with those who bow down.
Hadith says: salaat with jamaat has 27 times more reward than salaat alone.
The Holy Prophet (sallallahu alaihi wasallam) was constant his entire life in praying his salaat with jamaat. It wasn’t until the last few days of his (sallallahu alaihi wasallam) life when he was very sick that he gave up the jamaat.
Likewise the sahaba were the same way, meaning they never gave up the jamaat. They looked upon someone who missed jamaat as a hypocrite. The never missed the jamaat unless they had an excuse or they were travelling.