He reported God’s Messenger as saying, “By Him in whose hand my soul is, were it not that men among the believers are not satisfied with remaining behind me when I cannot get mounts for them, I would not stay behind when an expedition goes out in God’s path. By Him in whose hand my soul is, I wish I could be killed in God’s path and brought to life, then be killed and brought to life, then be killed and brought to life, then be killed.” (Bukhari and Muslim.)
Source: sunnah.com
Other translations
Arabic
وَعَنْهُ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «وَالَّذِي نَفْسِي بِيَدِهِ لَوْلَا أَنَّ رِجَالًا مِنَ الْمُسْلِمِينَ لَا تَطِيبُ أَنْفُسُهُمْ أَنْ يَتَخَلَّفُوا عَنِّي وَلَا أَجِدُ مَا أَحْمِلُهُمْ عَلَيْهِ مَا تَخَلَّفْتُ عَنْ سَرِيَّةٍ تَغْزُو فِي سَبِيلِ اللَّهِ وَالَّذِي نَفْسِي بِيَدِهِ لَوَدِدْتُ أنْ أُقتَلَ فِي سَبِيل الله ثمَّ أُحْيى ثمَّ أُقتَلُ ثمَّ أُحْيى ثمَّ أُقتَلُ ثمَّ أُحْيى ثمَّ أقتل»
sunnah.com