The Messenger of Allah ﷺ would give a third of the spoils after he would keep off the fifth.  

أَنَّهُ قَالَ كَانَ رَسُولُ اللَّهِ ﷺ يُنَفِّلُ الثُّلُثَ بَعْدَ الْخُمُسِ  

The Messenger of Allah ﷺ used to give a quarter of the booty as reward after the fifty had been kept off, and a third after the fifth had been kept off when he returned.  

أَنَّ رَسُولَ اللَّهِ ﷺ كَانَ يُنَفِّلُ الرُّبُعَ بَعْدَ الْخُمُسِ وَالثُّلُثَ بَعْدَ الْخُمُسِ إِذَا قَفَلَ  

Makhul said: I was the slave of a woman of Banu Hudhayl; afterwards she emancipated me. I did not leave Egypt until I had acquired all the knowledge that seemed to me to exist there. I then came to al-Hijaz and I did not leave it until I had acquired all the knowledge that seemed to be available. Then I came to al-Iraq, and I did not leave it until I had acquired all the knowledge that seemed to be available. I then came to Syria, and besieged it. I asked everyone about giving rewards from the booty. I did not find anyone who could tell me anything about it. I then met an old man called Ziyad ibn Jariyah at-Tamimi. I asked him: Have you heard anything about giving rewards from the booty? He replied: Yes. I heard Maslamah al-Fihri say: I was present with the Prophet ﷺ. He gave a quarter of the spoils on the outward journey and a third on the return journey.  

سَمِعْتُ مَكْحُولاً يَقُولُ كُنْتُ عَبْدًا بِمِصْرَ لاِمْرَأَةٍ مِنْ بَنِي هُذَيْلٍ فَأَعْتَقَتْنِي فَمَا خَرَجْتُ مِنْ مِصْرَ وَبِهَا عِلْمٌ إِلاَّ حَوَيْتُ عَلَيْهِ فِيمَا أُرَى ثُمَّ أَتَيْتُ الْحِجَازَ فَمَا خَرَجْتُ مِنْهَا وَبِهَا عِلْمٌ إِلاَّ حَوَيْتُ عَلَيْهِ فِيمَا أُرَى ثُمَّ أَتَيْتُ الْعِرَاقَ فَمَا خَرَجْتُ مِنْهَا وَبِهَا عِلْمٌ إِلاَّ حَوَيْتُ عَلَيْهِ فِيمَا أُرَى ثُمَّ أَتَيْتُ الشَّامَ فَغَرْبَلْتُهَا كُلُّ ذَلِكَ أَسْأَلُ عَنِ النَّفْلِ فَلَمْ أَجِدْ أَحَدًا يُخْبِرُنِي فِيهِ بِشَىْءٍ حَتَّى أَتَيْتُ شَيْخًا يُقَالُ لَهُ زِيَادُ بْنُ جَارِيَةَ التَّمِيمِيُّ فَقُلْتُ لَهُ هَلْ سَمِعْتَ فِي النَّفْلِ شَيْئًا قَالَ نَعَمْ سَمِعْتُ حَبِيبَ بْنَ مَسْلَمَةَ الْفِهْرِيَّ يَقُولُ شَهِدْتُ النَّبِيَّ ﷺ نَفَّلَ الرُّبُعَ فِي الْبَدْأَةِ وَالثُّلُثَ فِي الرَّجْعَةِ