The prohibition of asking too much with no need. The prohibition of withholding the rights of others and asking of them, which means refusing to give others their rights and asking for that to which one is not entitles
وَحَدَّثَنِي الْقَاسِمُ بْنُ زَكَرِيَّاءَ، حَدَّثَنَا عُبَيْدُ اللَّهِ بْنُ مُوسَى، عَنْ شَيْبَانَ، عَنْ مَنْصُورٍ، بِهَذَا الإِسْنَادِ . مِثْلَهُ . غَيْرَ أَنَّهُ قَالَ وَحَرَّمَ عَلَيْكُمْ رَسُولُ اللَّهِ صلى الله عليه وسلم . وَلَمْ يَقُلْ إِنَّ اللَّهَ حَرَّمَ عَلَيْكُمْ .
A hadith like this has been trransmitted on the authority of Mansur with a slight vairiation of words.