'Abdullah bin Amr narrated that:
the Prophet (ﷺ) 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."
Muhammad bin Jubair bin Mut'im narrated from his father, that:
the Messenger of Allah (ﷺ) said: "The one who severs ties will not enter Paradise." Ibn Abi 'Umar said: "Sufyan said: 'Meaning: Ties of the womb."