When the Smallest Deed Saves You

Hawzah News Agency- Muhammad ibn Ali Majiluyih narrated that his uncle Muhammad ibn Abil-Qasim narrated from Ahmad ibn Aba Abdullah al-Barqy,from his father, from Muhammad ibn Abi Umayr, from Muhammad ibn Imran that Imam Sadiq (pbuh) said:

يُؤْتَى بِعَبْدٍ يَوْمَ القِيَامَةِ لَيْسَ لَهُ حَسَنَةٌ، فَيُقَالُ لَهُ: اذْكُرْ أَوْ تَذَكَّرْ هَلْ لَكَ مِنْ حَسَنَةٍ؟
فَيَتَذَكَّرُ فَيَقُولُ: يَا رَبِّ، مَا لِي مِنْ حَسَنَةٍ إِلَّا أَنَّ فُلَانًا عَبْدَكَ الْمُؤْمِنَ مَرَّ بِي فَطَلَبْتُ مِنْهُ مَاءً فَأَعْطَانِي مَاءً، فَتَوَضَّأْتُ بِهِ وَصَلَّيْتُ لَكَ.
فَيَقُولُ الرَّبُّ تَبَارَكَ وَتَعَالَى: قَدْ غَفَرْتُ لَكَ، أَدْخِلُوا عَبْدِيَ الجَنَّةَ.

A servant will be brought on the Day of Judgment with no good deeds. He will be told: “Recall—do you have any good deed?”
He will remember and say: “My Lord, I have no good deed except that one of Your believing servants passed by me, and I asked him for water. He gave me water, so I performed wudhu with it and prayed to You.”
Allah, blessed and exalted, will say: “I have forgiven you. Enter My servant into Paradise.

Al-Khisal,Book 2,Chapter 76