Yahya al-Bakka' said that a man said to Ibn Umar (may Allah be pleased with them both): I love you for the sake of Allah. Ibn Umar (may Allah be pleased with them both) said: "But I detest you for the sake of Allah." He said: Why? He said: "You put on an affected voice in your call to prayer (adhan), and you take a wage for it."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 13003