the Prophet said: "Merely maintaining the ties of kinship is not adequate. But connecting the ties of kinship is when his ties to the womb are severed and he connects it."  

عَنِ النَّبِيِّ ﷺ قَالَ لَيْسَ الْوَاصِلُ بِالْمُكَافِئِ وَلَكِنَّ الْوَاصِلَ الَّذِي إِذَا انْقَطَعَتْ رَحِمُهُ وَصَلَهَا  

the Messenger of Allah said: "The one who severs ties will not enter Paradise." Ibn Abi 'Umar said: "Sufyan said: 'Meaning: Ties of the womb."  

قَالَ رَسُولُ اللَّهِ ﷺ لاَ يَدْخُلُ الْجَنَّةَ قَاطِعٌ قَالَ ابْنُ أَبِي عُمَرَ قَالَ سُفْيَانُ يَعْنِي قَاطِعَ رَحِمٍ