Abu Dhubyan related that 'Umar ibn al-Khattab asked him, "Abu Dhubyan, how large is your (soldier's) stipend?" "2500," he replied. He told him, "Abu Dhubyan, it was taken from agriculture and increased livestock before the lads of Quraysh were appointed over you. They do not consider the stipend to be income."
Source: sunnah.com
Other translations
Arabic
حَدَّثَنَا قَبِيصَةُ، قَالَ: حَدَّثَنَا وَهْبُ بْنُ إِسْمَاعِيلَ، عَنْ مُحَمَّدِ بْنِ قَيْسٍ، عَنْ أَبِي هِنْدَ الْهَمْدَانِيِّ، عَنْ أَبِي ظَبْيَانَ قَالَ: قَالَ لِي عُمَرُ بْنُ الْخَطَّابِ: يَا أَبَا ظَبْيَانَ، كَمْ عَطَاؤُكَ؟ قُلْتُ: أَلْفَانِ وَخَمْسُمِئَةٍ، قَالَ لَهُ: يَا أَبَا ظَبْيَانَ، اتَّخِذْ مِنَ الْحَرْثِ وَالسَّابْيَاءِ مِنْ قَبْلِ أَنْ تَلِيَكُمْ غِلْمَةُ قُرَيْشٍ، لاَ يُعَدُّ الْعَطَاءُ مَعَهُمْ مَالاً.
sunnah.com