Whoever relieves a believer's distress
مَنْ نَفَّسَ عَنْ مُؤْمِنٍ كُرْبَةً مِنْ كُرَبِ الدُّنْيَا، نَفَّسَ اللَّهُ عَنْهُ كُرْبَةً مِنْ كُرَبِ يَوْمِ الْقِيَامَةِ
Man naffasa 'an mu'minin kurbatan min kurabi-d-dunya, naffasa-llahu 'anhu kurbatan min kurabi yawmi-l-qiyamah.
"Whoever relieves a believer from one of the hardships of this world, Allah will relieve him from one of the hardships of the Day of Resurrection."
Narrated by Abu Hurayrah. Sahih Muslim 2699 · Nawawi's Forty · #36
A short reflection
Bring someone relief now, and the Owner of the Last Day owes you the same back in full.