Hadith 32, 40 Hadith an-Nawawi
On the authority of Abu Sa’eed al-Khudree (may Allah be pleased with him), that the Messenger of Allah (peace and blessings of Allah be upon him) said:
There should be neither harming (darar) nor reciprocating harm (dirar).

A hasan hadeeth related by Ibn Majah, ad-Daraqutnee and others as a musnad hadeeth. It was also related by Malik in al-Muwatta in mursal form from Amr bin Yahya, from his father from the Prophet (peace and blessings of Allah be upon him), but leaving Abu Sa’eed from the chain. And it has other chains of narrations that strengthen one another.
عَنْ أَبِي سَعِيدٍ سَعْدِ بْنِ مَالِكِ بْنِ سِنَانٍ الْخُدْرِيّ رَضِيَ اللهُ عَنْهُ أَنَّ رَسُولَ اللَّهِ صلى الله عليه و سلم قَالَ: " لَا ضَرَرَ وَلَا ضِرَارَ" . 
حَدِيثٌ حَسَنٌ، رَوَاهُ ابْنُ مَاجَهْ [راجع رقم:2341]، وَالدَّارَقُطْنِيّ [رقم:4/228]، وَغَيْرُهُمَا مُسْنَدًا. وَرَوَاهُ مَالِكٌ [2/746] فِي "الْمُوَطَّإِ" عَنْ عَمْرِو بْنِ يَحْيَى عَنْ أَبِيهِ عَنْ النَّبِيِّ صلى الله عليه و سلم مُرْسَلًا، فَأَسْقَطَ أَبَا سَعِيدٍ، وَلَهُ طُرُقٌ يُقَوِّي بَعْضُهَا بَعْضًا.