[Machine] And the Prophet ﷺ said: "When one of you advises his brother, let him advise him sincerely." And Ata' (may Allah be pleased with him) considered it permissible.
وَقَالَ النَّبِيُّ ﷺ: «إِذَا اسْتَنْصَحَ أَحَدُكُمْ أَخَاهُ فَلْيَنْصَحْ لَهُ». وَرَخَّصَ فِيهِ عَطَاءٌ.
I have given a pledge of allegiance to Messenger of Allah ﷺ for to testify that None has the right to be worshipped but Allah, and Muhammad is His Apostle, to offer prayers perfectly, to pay Zakat, to listen to and obey (Allah's and His Prophet's orders), and to give good advice to every Muslim.
سَمِعْتُ جَرِيرًا ؓ بَايَعْتُ رَسُولَ اللَّهِ ﷺ عَلَى شَهَادَةِ أَنْ لاَ إِلَهَ إِلاَّ اللَّهُ وَأَنَّ مُحَمَّدًا رَسُولُ اللَّهِ وَإِقَامِ الصَّلاَةِ وَإِيتَاءِ الزَّكَاةِ وَالسَّمْعِ وَالطَّاعَةِ وَالنُّصْحِ لِكُلِّ مُسْلِمٍ
Ibn ʿAbbas said, "Messenger of Allah ﷺ said, 'Do not go to meet the caravans on the way (for buying their goods without letting them know the market price); a town dweller should not sell the goods of a desert dweller on behalf of the latter.' I asked Ibn ʿAbbas, 'What does he mean by not selling the goods of a desert dweller by a town dweller?' He said, 'He should not become his broker.' "
قَالَ رَسُولُ اللَّهِ ﷺ لاَ تَلَقَّوُا الرُّكْبَانَ وَلاَ يَبِيعُ حَاضِرٌ لِبَادٍ قَالَ فَقُلْتُ لاِبْنِ عَبَّاسٍ مَا قَوْلُهُ لاَ يَبِيعُ حَاضِرٌ لِبَادٍ قَالَ لاَ يَكُونُ لَهُ سِمْسَارًا