“Whoever believes in Allah and the Last Day, let him maintain the bonds of kinship.”
(Bukhari)
Maintaining the bonds of kinship enjoys extraordinary importance in Islam. Conversely, severing the ties is very high on the list of enormities. Uniting the ties of kinship is a reason for prolonging life and gaining more sustenance. Anas ibn Malik relates that the Messenger of Allah ﷺ said: “Whoever loves that he would be granted more sustenance and that his life span would be prolonged, then he should unite his ties of kinship.” (Bukhari and Muslim)
Uniting the ties of kinship leads to gaining relationship with Allah. The Prophet ﷺ said: “Verily Allah created the universe and when He was done with the creation, ties of kinship came forward and said ‘this is the place for him who seeks refuge from severing (of blood-relationship).’ He said: ‘yes. Are you not satisfied that I should keep relationship with one who unites your ties of kinship and sever it with one who severs your (ties of kinship)?’ They (the ties of blood) said: ‘certainly so.’ Thereupon He said: ‘Then you got what you asked for’.” (Bukhari and Muslim)
Uniting the ties of kinship is one of the great reasons for entering Paradise. Abu Ayub Al-Ansari relates that a man said: O Messenger of Allah, tell me about a deed that gets me in Paradise. Whereupon the Messenger of Allah ﷺ said: “Worship Allah alone with no partner, observe prayer, give Zakat, and unite the ties of kinship.” (Bukhari and Muslim)