Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
quran:2:154 –

And do not say about those who are killed in the way of Allah, "They are dead." Rather, they are alive, but you perceive ˹it˺ not.  

And say not of those slain in God’s way, that, ‘They are dead’; rather they are living, their spirits are, according to a hadīth, contained in green birds that take wing freely wherever they wish in Paradise; but you are not aware, ˹but you˺ do not know their condition.
القرآن:٢:١٥٤ –

وَلَا تَقُولُوا لِمَنْ يُقْتَلُ فِي سَبِيلِ اللَّهِ أَمْوَاتٌ ۚ بَلْ أَحْيَاءٌ وَلَٰكِنْ لَا تَشْعُرُونَ  

{ولا تقولوا لمن يقتل في سبيل الله} هم {أموات بل} هم {أحياء} أرواحهم في حواصل طيور خضر تسرح في الجنة حيث شاءت لحديث بذلك {ولكن لا تشعرون} تعلمون ما هم فيه.