﴿ وَمِنْهُم مَّن يَسْتَمِعُ إِلَيْكَ حَتَّىٰٓ إِذَا خَرَجُوا۟ مِنْ عِندِكَ قَالُوا۟ لِلَّذِينَ أُوتُوا۟ ٱلْعِلْمَ مَاذَا قَالَ ءَانِفًا ۚ أُو۟لَٰٓئِكَ ٱلَّذِينَ طَبَعَ ٱللَّهُ عَلَىٰ قُلُوبِهِمْ وَٱتَّبَعُوٓا۟ أَهْوَآءَهُمْ ﴾

“Now among those [hapless sinners] are such as [pretend to] listen to thee, [O Muhammad,] and then, as soon as they leave thy presence, speak [with scorn] unto those who have understood [thy mes­sage]: “What is it that he has said just now?” It is such as these whose hearts God has sealed because they [always] followed but their own lusts”

Please check ayah 47:19 for complete tafsir.