وَحَدَّثَنِي مَالِكٌ، عَنِ ابْنِ شِهَابٍ، أَنَّهُ سَأَلَهُ عَنِ الرَّجُلِ، يَتَكَارَى الدَّابَّةَ ثُمَّ يُكْرِيهَا بِأَكْثَرَ مِمَّا تَكَارَاهَا بِهِ فَقَالَ لاَ بَأْسَ بِذَلِكَ ‏.‏

Malik related to me that he asked Ibn Shihab about a man whohired an animal, and then re-hired it out for more than what he hiredit for. He said, "There is no harm in that." Translation Not Available

Book Ref: Muwatta Imam Malik Book 31 Hadith 1388
Web Ref:  Muwatta Imam Malik Book 31 Hadith 102