etiquette of speaking to him

Al-Ḥujurāt 49:1

يَٰٓأَيُّهَا ٱلَّذِينَ ءَامَنُواْ لَا تُقَدِّمُواْ بَيۡنَ يَدَيِ ٱللَّهِ وَرَسُولِهِۦۖ وَٱتَّقُواْ ٱللَّهَۚ إِنَّ ٱللَّهَ سَمِيعٌ عَلِيمٞ ١

O you who have believed, do not put [yourselves] before Allah and His Messenger but fear Allah. Indeed, Allah is Hearing and Knowing.

Al-Ḥujurāt 49:2

يَٰٓأَيُّهَا ٱلَّذِينَ ءَامَنُواْ لَا تَرۡفَعُوٓاْ أَصۡوَٰتَكُمۡ فَوۡقَ صَوۡتِ ٱلنَّبِيِّ وَلَا تَجۡهَرُواْ لَهُۥ بِٱلۡقَوۡلِ كَجَهۡرِ بَعۡضِكُمۡ لِبَعۡضٍ أَن تَحۡبَطَ أَعۡمَٰلُكُمۡ وَأَنتُمۡ لَا تَشۡعُرُونَ ٢

O you who have believed, do not raise your voices above the voice of the Prophet or be loud to him in speech like the loudness of some of you to others, lest your deeds become worthless while you perceive not.

Al-Ḥujurāt 49:3

إِنَّ ٱلَّذِينَ يَغُضُّونَ أَصۡوَٰتَهُمۡ عِندَ رَسُولِ ٱللَّهِ أُوْلَٰٓئِكَ ٱلَّذِينَ ٱمۡتَحَنَ ٱللَّهُ قُلُوبَهُمۡ لِلتَّقۡوَىٰۚ لَهُم مَّغۡفِرَةٞ وَأَجۡرٌ عَظِيمٌ ٣

Indeed, those who lower their voices before the Messenger of Allah - they are the ones whose hearts Allah has tested for righteousness. For them is forgiveness and great reward.

Al-Ḥujurāt 49:4

إِنَّ ٱلَّذِينَ يُنَادُونَكَ مِن وَرَآءِ ٱلۡحُجُرَٰتِ أَكۡثَرُهُمۡ لَا يَعۡقِلُونَ ٤

Indeed, those who call you, [O Muhammad], from behind the chambers - most of them do not use reason.

Al-Ḥujurāt 49:5

وَلَوۡ أَنَّهُمۡ صَبَرُواْ حَتَّىٰ تَخۡرُجَ إِلَيۡهِمۡ لَكَانَ خَيۡرٗا لَّهُمۡۚ وَٱللَّهُ غَفُورٞ رَّحِيمٞ ٥

And if they had been patient until you [could] come out to them, it would have been better for them. But Allah is Forgiving and Merciful.