Ibn Abi Dunya reported: Bilal ibn Sa’d, may Allah have mercy on him, said, “Do not be one with two faces and two tongues, making a show for people to praise you while your heart is wicked.”
Source: al-Ikhlāṣ li Ibn Abī Dunyā 28
عن ابن أبي الدنيا قال بلال بن سعد رحمه الله لَا تَكُنْ ذَا وَجْهَيْنِ وَذَا لِسَانَيْنِ تُظْهِرُ لِلنَّاسِ لِيَحْمَدُوكَ وَقَلْبُكَ فَاجِرٌ
28 الإخلاص والنية لابن أبي الدنيا
