Pray for your absent brothers/sisters in faith.

This hadith speaks of the power of prayer and how it can benefit others. It is narrated by Abu Al-Darda', who heard it from the Prophet Muhammad ﷺ. The hadith states that when a Muslim prays for their absent brother or sister in faith, the angels will respond with an 'Amin'. This is a sign of approval from Allah and shows that He hears our prayers. Furthermore, this hadith also implies that when we pray for others we may receive something similar in return. This teaches us to always think positively about our fellow Muslims and to pray for them even if they are not present with us physically.