وَإِنّي خِفتُ المَوالِيَ مِن وَرائي وَكانَتِ امرَأَتي عاقِرًا فَهَب لي مِن لَدُنكَ وَلِيًّا

And I fear the successors after me, and my wife is barren, so grant me from Yourself an heir.