Muwatta Malik, Book 21, Hadith 988 (In-Book) ⓘ

Yahya related to me from Malik from Abu'z-Zinad from al-Araj from Abu Hurayra that the Messenger of Allah, may Allah bless him and grant him peace, said, "By He in whose hand my self is! I would like to fight in the way of Allah and be killed, then be brought to life again so I could be killed, and then be brought to life again so I could be killed." Abu Hurayra said three times, "I testify to it by Allah!"

حَدَّثَنِي يَحْيَى، عَنْ مَالِكٍ، عَنْ أَبِي الزِّنَادِ، عَنِ الأَعْرَجِ، عَنْ أَبِي هُرَيْرَةَ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ ‏ "‏ وَالَّذِي نَفْسِي بِيَدِهِ لَوَدِدْتُ أَنِّي أُقَاتِلُ فِي سَبِيلِ اللَّهِ فَأُقْتَلُ ثُمَّ أُحْيَا فَأُقْتَلُ ثُمَّ أُحْيَا فَأُقْتَلُ ‏" ‏ ‏.‏ فَكَانَ أَبُو هُرَيْرَةَ يَقُولُ ثَلاَثًا أَشْهَدُ بِاللَّهِ ‏.‏