No good deed is insignificant, no matter how small
MUSLIM 2626:
from Abū Dhar —
The Prophet ﷺ said to me: “Do not regard any good deed as insignificant, even if it is that you meet your brother with a cheerful face.”
مسلم ٢٦٢٦:
عن ابو ذر —
قَالَ لِيَ النَّبِيُّ ﷺ: «لاَ تَحْقِرَنَّ مِنَ الْمَعْرُوفِ شَيْئًا وَلَوْ أَنْ تَلْقَى أَخَاكَ بِوَجْهٍ طَلْقٍ»