It is reported that a man once came to 'Abdullāh b. 'Umar - Allāh be pleased with him - and said:

I love you for Allāh.

Ibn 'Umar replied:

Then bear witness that I hate you for Allāh!

The man asked, "Why?"

He replied, "Because you sing in your adhān (call to prayer), and you take a wage [for calling it]!"

Al-Ṭabarānī, Al-Mu'jam Al-Kabīr, article 13059; from Shaykh Al-Albānī, Al-Saḥīḥah 1:104, where he grades it authentic.