منْ قَطَعَكِ فَقَدْ قَطَعَ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَ آلِهِ، لِأَنَّكِ بَضْعَةٌ مِنْهُ، وَ رُوحُهُ الَّذِي بَيْنَ جَنْبَيْهِ
he who disrespects you will have disrespected the messenger of Allah, peace be upon him and his Household. This is because you are an inseparable part of him (i.e. the Holy Prophet), and you are his soul with which he lives.
source : erfan.ir