"What kept you from praying? Are you not a Muslim man?" He said: "Yes, but I had already prayed with my family." The Messenger of Allah (ﷺ)said to him: "When you come you should pray with the people even if you have already prayed."
Sunan an-Nasa'i Book 10, Hadith 81
← Previous Hadith "I heard the Messenger of Allah (ﷺ) say: 'Whoever does wudu' properly, then walks to (attend) the prescribed prayer, and prays with the people or with the congregation or in the Masjid, Allah will forgive him his sins."

Sunan an-Nasa'i Book 10, Hadith 80 Next Hadith → "I attended Fajr prayer with the Messenger of Allah (ﷺ)in Masjid Al Khaif. When he finished praying, he saw two men at the back of the people who had not prayed with him. He said: 'Bring them here.' So they were brought to him, trembling. He said: 'What kept you from praying with us? They said: '0 Messenger of Allah (ﷺ) we has already prayed in our lodgings.' He said: 'Do not do that. If you have already prayed in your lodgings, then you come to a Masjid in which there is a congregation, then pray with them, and it will be a voluntary prayer for you."'

Sunan an-Nasa'i Book 10, Hadith 82