"I met Abu Dharr and said: 'Tell me a Hadith.' He said. Yes, the Messenger of Allah ﷺ said: There is no Muslim worshiper who spends from each type of his wealth on a pair (of things) in the cause of Allah, but the keepers of Paradise will welcome him, all of them calling him to what they have (of reward).' I said: "How is that?" He said: "If it is camels, he gives two, and if it is cows, he gives two.'" (Using translation from Nasāʾī 3185)
قَالَ النَّبِيُّ ﷺ «مَا مِنْ عَبْدٍ يُنْفِقُ مِنْ كُلِّ مَالٍ لَهُ زَوْجَيْنِ فِي سَبِيلِ اللَّهِ إِلَّا اسْتَقْبَلَتْهُ حَجَبَةُ الْجَنَّةِ كُلُّهُمْ يَدْعُوهُ إِلَى مَا عِنْدَهُ» قَالَ قُلْتُ وَكَيْفَ ذَاكَ؟ قَالَ «إِنْ كَانَ رِجَالًا فَرَجُلَيْنِ وَإِنْ كَانَ إِبِلًا فَبَعِيرَيْنِ وَإِنْ كَانَ بَقَرًا فَبَقَرَتَيْنِ»