Translation:

5. "Now I fear (what) my relatives (and colleagues) (will do) after me: but my wife is barren: so give me an heir as from Thyself

Notes (Tafseer)

2459. His was not merely a desire for a son. If it had been, he would have prayed much earlier in his life, when he was a young man. He was too full of true piety to put merely selfish things into his prayers. But here was a public need, in the service of the Lord.