Hadith.4660 - Ali ibn Al-Husayn (peace be upon them) said to one of his companions: "When seeking a child, say: 'My Lord (azj), do not leave me alone [without offspring], and You (swt) are the best of inheritors' and add; 'Grant me from Yourself (swt) a successor who will inherit from me during my life and seek forgiveness for me after my death. Make him well-formed in creation and do not allow Satan to have any share in him. O Allah (swt), I seek Your (swt) forgiveness and repent to You (swt). Indeed, You (swt) are the Most Forgiving, the Most Merciful.' Repeat this seventy times. For whoever frequently says this supplication, Allah (swt) the Exalted will grant him whatever he wishes of wealth, children, and the goodness of this world and the Hereafter. For Allah (swt) says: 'Seek forgiveness from your Lord (azj); indeed, He (swt) is ever Forgiving. He (swt) will send rain to you in abundance and supply you with wealth and children and make for you gardens and make for you rivers' (Surah Nuh 71:10-12)."

Translation: Bab Ul Qaim Publications — attributed by Thaqalayn·The Arabic above is the original.