Abu Mas’ud reported: A man came with a bridled camel and he said, “This is for the cause of Allah.” The Messenger of Allah, peace and blessings be upon him, said, “You will have for it seven hundred camels on the Day of Resurrection. Each of them will be bridled.”
Source: Sahih Muslim 1892
Grade: Sahih (authentic) according to Muslim
عَنْ أَبِي مَسْعُودٍ الْأَنْصَارِيِّ قَالَ جَاءَ رَجُلٌ بِنَاقَةٍ مَخْطُومَةٍ فَقَالَ هَذِهِ فِي سَبِيلِ اللَّهِ فَقَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ لَكَ بِهَا يَوْمَ الْقِيَامَةِ سَبْعُ مِائَةِ نَاقَةٍ كُلُّهَا مَخْطُومَةٌ
1892 صحيح مسلم كِتَاب الْإِمَارَةِ بَاب فَضْلِ الصَّدَقَةِ فِي سَبِيلِ اللَّهِ وَتَضْعِيفِهَا