Mujahid said, "I was with 'Abdullah ibn 'Amr while his slave was skinning a sheep. He said, 'Boy! When you finish, start with the Jewish neighbour.' A man there exclaimed, 'Jewish? May Allah correct you!' He replied, 'I heard the Messenger of Allah, may Allah bless him and grant him peace, recommend that we treat our neighbours well until we feared (or we thought) that he would order us to make them our heirs.'"
Source: sunnah.com
Other translations
Arabic
حَدَّثَنَا أَبُو نُعَيْمٍ، قَالَ: حَدَّثَنَا بَشِيرُ بْنُ سُلَيْمَانَ، عَنْ مُجَاهِدٍ قَالَ: كُنْتُ عِنْدَ عَبْدِ اللهِ بْنِ عَمْرٍو، وَغُلاَمُهُ يَسْلُخُ شَاةً، فَقَالَ: يَا غُلاَمُ، إِذَا فَرَغْتَ فَابْدَأْ بِجَارِنَا الْيَهُودِيِّ، فَقَالَ رَجُلٌ مِنَ الْقَوْمِ: الْيَهُودِيُّ أَصْلَحَكَ اللَّهُ؟ قَالَ: إِنِّي سَمِعْتُ النَّبِيَّ صلى الله عليه وسلم يُوصِي بِالْجَارِ، حَتَّى خَشِينَا أَوْ رُئِينَا أَنَّهُ سَيُوَرِّثُهُ.
sunnah.com