Allah says, some hypocrites bother the Messenger of Allah by questioning his character, saying,

[هُوَ أُذُنٌ]

(he is (lending his) ear), to those who say anything about us; he believes whoever talks to him. Therefore, if we went to him and swore, he would believe us. Similar was reported from Ibn `Abbas, Mujahid and Qatadah. Allah said,

[قُلْ أُذُنُ خَيْرٍ لَّكُمْ]

(Say: "He listens to what is best for you''), he knows who's saying the truth and who is lying,

[يُؤْمِنُ بِاللَّهِ وَيُؤْمِنُ لِلْمُؤْمِنِينَ]

(he believes in Allah; has faith in the believers), he believes the believers,

[وَرَحْمَةٌ لِّلَّذِينَ ءَامَنُواْ مِنكُمْ]

(and is a mercy to those of you who believe''), and a proof against the disbelievers,

[وَالَّذِينَ يُؤْذُونَ رَسُولَ اللَّهِ لَهُمْ عَذَابٌ أَلِيمٌ]

(But those who annoy Allah's Messenger, will have a painful torment.)

[يَحْلِفُونَ بِاللَّهِ لَكُمْ لِيُرْضُوكُمْ وَاللَّهُ وَرَسُولُهُ أَحَقُّ أَن يُرْضُوهُ إِن كَانُواْ مُؤْمِنِينَ - أَلَمْ يَعْلَمُواْ أَنَّهُ مَن يُحَادِدِ اللَّهَ وَرَسُولَهُ فَأَنَّ لَهُ نَارَ جَهَنَّمَ خَالِداً فِيهَا ذَلِكَ الْخِزْىُ الْعَظِيمُ ]

(62. They swear by Allah to you (Muslims) in order to please you, but it is more fitting that they should please Allah and His Messenger, if they are believers.) (63. Know they not that whoever opposes and shows hostility to Allah and His Messenger, certainly for him will be the fire of Hell to abide therein. That is the extreme disgrace.)