وَإِنِّي خِفْتُ الْمَوَالِيَ مِن وَرَائِي وَكَانَتِ امْرَأَتِي عَاقِرًا فَهَبْ لِي مِن لَّدُنكَ وَلِيًّا ﴿٥﴾

Wa innee khiftul-mawaaliya min waraaa'ee wa kaanatim-ra'atee 'aaqiran fahab lee mil-ladunka waliyyaa.

And indeed, I fear the successors after me, and my wife has been barren, so give me from Yourself an heir

Reference: Surah Maryam 19:5