﴿ وَإِنِّى خِفْتُ ٱلْمَوَٰلِىَ مِن وَرَآءِى وَكَانَتِ ٱمْرَأَتِى عَاقِرًۭا فَهَبْ لِى مِن لَّدُنكَ وَلِيًّۭا ﴾

“"Now, behold, I am afraid of [what] my kinsfolk [will do] after I am gone, for my wife has always been barren. Bestow, then, upon me, out of Thy grace, the gift of a successor”

Please check ayah 19:6 for complete tafsir.