Good Deeds Can Wipe Out Major Sins

Imam Musa Shahin Lashin said:

أن سقى الماء يكفر الكبائر

‘𝗣𝗿𝗼𝘃𝗶𝗱𝗶𝗻𝗴 𝘄𝗮𝘁𝗲𝗿 𝘁𝗼 𝗼𝘁𝗵𝗲𝗿𝘀 𝗰𝗮𝗻 𝘄𝗶𝗽𝗲 𝗼𝘂𝘁 𝗺𝗮𝗷𝗼𝗿 𝘀𝗶𝗻𝘀 [𝗸𝗮𝗯𝗮𝗮𝗶𝗿].’

[‘Fath al-Mun’im’, 9/23].

He derived this from the following Hadith:

The Prophet said:

أَنَّ امْرَأَةً بَغِيًّا رَأَتْ كَلْبًا فِي يَوْمٍ حَارٍّ يُطِيفُ بِبِئْرٍ قَدْ أَدْلَعَ لِسَانَهُ مِنَ الْعَطَشِ فَنَزَعَتْ لَهُ بِمُوقِهَا فَغُفِرَ لَهَا

‘A prostitute saw a dog moving around a well on a hot day and hanging out its tongue because of thirst. She drew water for it in her shoe and she was pardoned.’

[‘Sahih Muslim’, 2245a].

https://sunnah.com/muslim:2245a

So she was a prostitute and that’s a major sin, but she was forgiven due to this act. So if you have committed major sins, do not despair.

And Imam al-Qurtubi said: this was the reward of giving water to a dog, so imagine the rewards of giving water to human beings.

We should all try to fund water-well projects if we can.