Sayyiduna al-Ala' bin Kharijah (may Allah be pleased with him) narrates this saying of the Prophet (peace and blessings be upon him): "Learn as much of your lineages as will enable you to maintain the ties of kinship, for maintaining the ties of kinship is a cause of love within the family, of increase in wealth and of a longer life."
Al-Tabarani recorded it, and its narrators have been declared trustworthy.