The Prophet ﷺ said: No (Muslim) man will desert a man who is a Muslim in a place where his respect may be violated and his honour aspersed without Allah deserting him in a place here he wishes his help; and no (Muslim) man who will help a Muslim in a place where his honour may be aspersed and his respect violated without Allah helping him in a place where he wishes his help. Yahya said: 'Ubaid Allah b. 'Abd Allah b. 'Umar and 'Uqbah b. Shaddad transmitted it to me. Abu Dawud said: This yahya b. Sulaim is the son of Zaid, the freed slave of the Prophet ﷺ, and Isma'il b. Bashir is the freed slave of Banu Maghalah. Sometimes the name of 'Utbah b. Shaddad is mentioned instead of 'Uqbah. (Using translation from Abū Dāʾūd 4884)
حَدَّثَنِي يَحْيَى بْنُ سُلَيْمِ بْنِ زَيْدٍ مَوْلَى رَسُولِ اللهِ ﷺ أَنَّهُ سَمِعَ إِسْمَاعِيلَ بْنَ بَشِيرٍ مَوْلَى بَنِي مَغَالَةَ يَقُولُ سَمِعْتُ جَابِرَ بْنَ عَبْدِ اللهِ وَأَبَا طَلْحَةَ بْنَ سَهْلٍ الْأَنْصَارِيَّيْنِ يَقُولَانِ قَالَ رَسُولُ اللهِ ﷺ مَا مِنْ امْرِئٍ يَخْذُلُ امْرَأً مُسْلِمًا عِنْدَ مَوْطِنٍ تُنْتَهَكُ فِيهِ حُرْمَتُهُ وَيُنْتَقَصُ فِيهِ مِنْ عِرْضِهِ إِلَّا خَذَلَهُ اللهُ ﷻ فِي مَوْطِنٍ يُحِبُّ فِيهِ نُصْرَتَهُ وَمَا مِنْ امْرِئٍ يَنْصُرُ امْرَأً مُسْلِمًا فِي مَوْطِنٍ يُنْتَقَصُ فِيهِ مِنْ عِرْضِهِ وَيُنْتَهَكُ فِيهِمِنْ حُرْمَتِهِ إِلَّا نَصَرَهُ اللهُ فِي مَوْطِنٍ يُحِبُّ فِيهِ نُصْرَتَهُ