The Prophet ﷺ said: If anyone guards a believer from a hypocrite, Allah will send an angel who will guard his flesh on the Day of Resurrection from the fire of Jahannam; but if anyone attacks a Muslim saying something by which he wishes to disgrace him, he will be restrained by Allah on the bridge over Jahannam till he is acquitted of what he said. (Using translation from Abū Dāʾūd 4883)
عَنِ النَّبِيِّ ﷺ قَالَ مَنْ حَمَى مُؤْمِنًا مِنْ مُنَافِقٍ يَعِيبُهُ بَعَثَ اللهُ تَبَارَكَ وَتَعَالَى مَلَكًا يَحْمِي لَحْمَهُ يَوْمَ الْقِيَامَةِ مِنْ نَارِ جَهَنَّمَ وَمَنْ بَغَى مُؤْمِنًا بِشَيْءٍ يُرِيدُ بِهِ شَيْنَهُ حَبَسَهُ اللهُ تَعَالَى عَلَى جِسْرِ جَهَنَّمَ حَتَّى يَخْرُجَ مِمَّا قَالَ