Hakim al Umma Mawlana Ashraf Ali Thanawi (Allah have mercy on him) said,

‘If one finds effect and influence (taseer) in the company of a Shaikh then he should,
1. Value this company
2. Develop extreme love and caring for this Shaikh
3. Follow his instructions thoroughly
4. Keep him happy,
5. Not to do anything that annoys him, because this results in cessation of receiving spiritual benefit (fayuz) for him.

In the initial verses of chapter Hujarat (49) the etiquette for (approaching) the Prophet (Allah bless him and grant him peace) are mentioned. The same rules for etiquette and love apply to the Shaikh, as he is a perfect (kamil) deputy (khalifa) of the Prophet.’

Taleemud Deen, page 126

49: The Private Apartments
With the name of Allah, the All-Merciful, the Very-Merciful.
[49:1]
O you who believe, do not proceed ahead of Allah and His Messenger, and fear Allah. Surely Allah is All-Hearing, All-Knowing.

[49:2]
O you who believe, do not raise your voices above the voice of the Prophet, and be not loud when speaking to him, as you are loud when speaking to one another, lest your good deeds should become void while you are not aware.

[49:3]
Surely, those who lower their voices before Allah’s Messenger are the ones whose hearts Allah has tested for piety; for them there is forgiveness, and a great reward.

[49:4]
As for those who call you from behind the chambers, most of them have no sense.

[49:5]
Had they remained patient until you come out to them, it would have been much better for them. And Allah is Most-Forgiving, Very-Merciful.

[49:6]
O you who believe, if a sinful person brings you a report, verify its correctness, lest you should harm a people out of ignorance, and then become remorseful on what you did.

[49:7]
And know that among you there is the Messenger of Allah. If he obeys you in many a matter, you will certainly fall into hardship. But Allah has endeared to you the Faith, and made it beautiful in your hearts, and made detestable to you the disbelief and sins and disobedience. Such people are rightly guided,

[49:8]
as a grace from Allah, and as a blessing. And Allah is All-Knowing, All-Wise.