Mishkat al-Masabih 3756
‘Amr b. al-'As said:
God’s Messenger sent ordering me to collect my weapons and clothing and come to him. I came to him when he was performing ablution, and he said, “I sent for you, ‘Amr, to dispatch you on a matter in which God will keep you safe and grant you booty, and I shall make you an allotment from the spoil.” I replied, “My emigration, Messenger of God, was not for the sake of property, but was only for the sake of God and His Messenger.” He said, “Honest property is good 1 for an honest man.” 

It is transmitted in Sharh as- sunna , and Ahmad transmitted something similar. His version has “Good is honest property 2 for an honest man.”

1. Ni'imma bil mal as-salih .
2. Ni'ma’ al-mal as-salih .
وَعَن عَمْرِو بن العاصِ قَالَ: أَرْسَلَ إِلَى رَسُولِ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «أَنِ اجْمَعْ عَلَيْكَ سِلَاحَكَ وَثِيَابَكَ ثُمَّ ائْتِنِي» قَالَ: فَأَتَيْتُهُ وَهُوَ يَتَوَضَّأُ فَقَالَ: «يَا عَمْرُو إِنِّي أَرْسَلْتُ إِلَيْكَ لِأَبْعَثَكَ فِي وُجْةٍ يُسَلِّمُكَ اللَّهُ وَيُغَنِّمُكَ وَأَزْعَبَ لَكَ زَعْبَةً مِنَ الْمَالِ» . فَقُلْتُ: يَا رَسُولَ اللَّهِ مَا كَانَتْ هِجْرَتِي لِلْمَالِ وَمَا كَانَتْ إِلَّا لِلَّهِ ولرسولِه قَالَ: «نِعِمَّا بِالْمَالِ الصَّالِحِ لِلرَّجُلِ الصَّالِحِ» . رَوَاهُ فِي «شَرْحِ السُّنَّةِ» وَرَوَى أَحْمَدُ نَحْوَهُ وَفِي روايتِه: قَالَ: «نِعْمَ المالُ الصَّالحُ للرَّجُلِ الصالحِ»