Surah Ali 'Imran 3:169

وَلَا تَحْسَبَنَّ ٱلَّذِينَ قُتِلُوا۟ فِى سَبِيلِ ٱللَّهِ أَمْوَٰتًۢا ۚ بَلْ أَحْيَآءٌ عِندَ رَبِّهِمْ يُرْزَقُونَ

And never think of those who have been killed in the cause of Allāh as dead. Rather, they are alive with their Lord, receiving provision,

Translation: Saheeh International

Tafsir

The following was revealed regarding martyrs Count not those who were slain read qutilū or quttilū in God’s way that is for the sake of His religion as dead but rather that they are living with their Lord their spirits inside green birds that take wing freely wherever they wish in Paradise as reported in a hadīth; …

Excerpt from Tafsir al-Jalalayn, commentary on 3:169, via Quran.com. The reader has the full commentary and 9 more tafsirs.