51:28 fa awjasa minhum khiyfah* qaaluu laa takhaf* wa bash-sharuuhu bi gulaamin ‘Aliym

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Ahmed Raza Khan: Mohammed Aqib Qadri:
He therefore inwardly sensed fear of them; they said, "Do not fear!"; and they gave him the glad tidings of a knowledgeable son.

Yusuf Ali:
(When they did not eat), He conceived a fear of them. They said, "Fear not," and they gave him glad tidings of a son endowed with knowledge.

Pickthal:
Then he conceived a fear of them. They said: Fear not! and gave him tidings of (the birth of) a wise son.