Abu Hurairah may Allah be pleased with him narrated that : the Prophet said: "No group gather in a sitting in which they do not remember Allah, nor sent Salat upon their Prophet, except it will be a source of remorse for them. If He wills, He will punish them, and if He wills, He will forgive them".
Furthermore, this hadith teaches us about repentance; even if we forget to remember Allah or send salat upon His Prophet, we can still repent for our mistake by seeking forgiveness from Him through sincere repentance and good deeds afterwards. In conclusion, this hadith encourages us to always remember Allah in all aspects of life so that He may forgive our sins and grant us success in both worlds.