Surah 5

Surah 5:105

"You who believe! Look to yourselves. No one who goes astray can harm you, if you are (rightly) guided. To God is your return – all (of you) – and then He will inform you about what you have done."
One is Required to Reform Himself First Verses 5:105
Show Full Scripture Context (5:105) — 1 Verse
Verse 105

يَـٰٓأَيُّهَا ٱلَّذِينَ ءَامَنُواْ عَلَيۡكُمۡ أَنفُسَكُمۡۖ لَا يَضُرُّكُم مَّن ضَلَّ إِذَا ٱهۡتَدَيۡتُمۡۚ إِلَى ٱللَّهِ مَرۡجِعُكُمۡ جَمِيعٗا فَيُنَبِّئُكُم بِمَا كُنتُمۡ تَعۡمَلُونَ

You who believe! Look to yourselves. No one who goes astray can harm you, if you are (rightly) guided. To God is your return – all (of you) – and then He will inform you about what you have done.

Allah commands His believing servants to reform themselves and to do as many righteous deeds as possible. He also informs them that whoever reforms himself, he would not be affected by the wickedness of the wicked, whether they were his relatives or otherwise.
Imam Ahmad recorded that Qays said, "Abu Bakr As-Siddiq stood up, thanked Allah and praised Him and then said, 'O people! You read this Ayah,
{O you who believe! Take care of yourselves. If you follow the right guidance, no hurt can come to you from those who are in error.}

You explain it the wrong way. I heard the Messenger of Allah say,
'If the people witness evil and do not change it, then Allah is about to send His punishment to encompass them.'
I (Qays) also heard Abu Bakr say, 'O people! Beware of lying, for lying contradicts faith.'"

About this Source & Scholarly Authority (Tafsir Ibn Kathir)

Universal Sunni Consensus: Tafsir al-Qur'an al-Azim by Hafiz Ibn Kathir (701–774 AH / 1301–1373 AD) is universally regarded across all major schools of Sunni Islam (traditional, Salafi, Ash'ari) as the most authoritative classical exegesis. It is prized because it relies on Tafsir bil-Ma'thur—interpreting the Quran using the Quran itself, authentic Hadiths of Prophet Muhammad, and recorded statements of the early Companions (Sahabah).

Standard English Edition: This text is from the standard 10-volume English abridgment published by Dar-us-Salam Publications (supervised by Shaykh Safiur-Rahman Al-Mubarakpuri), which is the official, most widely distributed English Quranic commentary in mosques and Islamic libraries worldwide today.