Translation of the verse 10 from Surah Al-Muzzammil : Number of verses 20 - - page 574 - Part 29.
And be patient (O Muhammad SAW) with what they say, and keep away from them in a good way.
And be patient over what they say and avoid them with gracious avoidance.
(73:10) And bear patiently the vain things they utter, and gracefully *11 forsake them.
*11) "Depart from them" does not mean "Break off all ties with them and stop preaching to them", but it means; "Do not have intimate and friendly relations with them: disregard their foolish behaviour and their nonsense." However, you should do so without showing any grief, anger or temper but gracefully like a noble person, who would disregard the abusive remarks of a mean person without minding them at all. This should not create the misunderstanding that the Holy Prophet's conduct was any different from it; therefore, Allah gave him this instruction. As a matter of fact, the Holy Prophet (upon whom be peace) was already following this very mode of conduct; this instruction was given in the Qur'an so as to tell the disbelievers: "It is not due to any weakness on the part of the Prophet that he is not responding to what you are saying against him, but Allah Himself has taught His Messenger to adopt this noble way of conduct in response to your foolish behaviour. "
Source : Al-Muzzammil Verse 10: And be patient over what they say and avoid them with gracious avoidance.