Abu Dawud Book 28, Hadith Number 4148.

Narated By Fudalah ibn Ubayd : Abdullah ibn Buraydah said: A man from the companions of the Prophet (PBUH) travelled to Fudalah ibn Ubayd when he was in Egypt.

He came to him and said: I have not come to you to visit you. But you and I heard a tradition from the Apostle of Allah (PBUH). I hope you may have some knowledge of it.

He asked: What is it? He replied: So and so. He said: Why do I see you dishevelled when you are the ruler of this land?

He said: The Apostle of Allah (PBUH) has forbidden us to indulge much in luxury.

He said: Why do I see you unshod? He replied: The Prophet (PBUH) used to command us to go barefoot at times.