Sayyiduna Abu Umamah (may Allah be pleased with him) says: The Messenger of Allah (peace and blessings be upon him) said: "Among the people of the worst standing with Allah on the Day of Resurrection is a servant who ruined his Hereafter for the sake of another's worldly gain."
Hadith Referenceالمعجم الكبير للطبراني / باب الصاد / 7528