The Messenger of Allah said: "Whoever kills a Mu'ahad with no justification, Allah will forbid Paradise to him and he will not even smell its fragrance." (Using translation from Nasāʾī 4748)  

قَالَ رَسُولُ اللهِ ﷺ مَنْ قَتَلَ نَفْسًا مُعَاهَدَةً بِغَيْرِ حَقِّهَا فَقَدْ حَرَّمَ اللهُ عَلَيْهِ الْجَنَّةَ أَنْ يَشُمَّرِيحَهَا  

[Machine] When Abdullah arrived, he was given the choice between thirty thousand (pieces) of silver and a set of dishes. He chose the dishes. He then met some traders from my town and sold the dishes to them for ten thousand (pieces) of silver. He later met Abu Bakrah and said to him, "Did you not see how I deceived them?" Abu Bakrah asked, "How?" Abdullah then told him about it. Abu Bakrah said, "I made up my mind to retrieve them from you, or I swore (an oath) that you would return them because I heard the Messenger of Allah ﷺ forbidding such deceit."  

فَلَمَّا قَدِمَ خُيِّرَ عَبْدُ اللهِ بَيْنَ ثَلَاثِينَ أَلْفًا وَبَيْنَ آنِيَةٍ مِنْ فِضَّةٍ قَالَ فَاخْتَارَ الْآنِيَةَ قَالَ فَقَدِمَ تُجَّارٌ مِنْ دَارِينَ فَبَاعَهُمْ إِيَّاهَا الْعَشَرَةَ ثَلَاثَ عَشْرَةَ ثُمَّ لَقِيَ أَبَا بَكْرَةَ فَقَالَ أَلَمْ تَرَ كَيْفَ خَدَعْتُهُمْ؟ قَالَ كَيْفَ؟ فَذَكَرَ لَهُ ذَلِكَ قَالَ عَزَمْتُ عَلَيْكَ أَوْ أَقْسَمْتُ عَلَيْكَ لَتَرُدَّنَّهَا فَإِنِّي سَمِعْتُ رَسُولَ اللهِ ﷺ يَنْهَى عَنْ مِثْلِ هَذَا