[Machine] The Prophet ﷺ used to playfully stick out his tongue at Al-Hussein (may Allah be pleased with him), and when the young boy stuck his tongue back, he would move it towards him. Uyaynah ibn Badr said to him, "Should I not show you how to deal with him? By Allah, he will surely be your child. His face has already started resembling yours, and I have never seen you kiss him." The Prophet ﷺ said, "Whoever does not show mercy, will not be shown mercy."  

كَانَ النَّبِيُّ ﷺ يَدْلَعُ لِسَانَهُ لِلْحُسَيْنِ فَيَرَى الصَّبِيُّ حُمْرَةَ لِسَانِهِ فَيَهَشُّ إِلَيْهِ فَقَالَ لَهُ عُيَيْنَةُ بْنُ بَدْرٍ أَلَا أَرَاهُ يَصْنَعُ هَذَا بِهَذَا فَوَاللَّهِ إِنَّهُ لَيَكُونُ لِيَ الْوَلَدُ قَدْ خَرَجَ وَجْهُهُ وَمَا قَبَّلْتُهُ قَطُّ فَقَالَ النَّبِيُّ ﷺ «مَنْ لَا يَرْحَمُ لَا يُرْحَمُ»