And he felt from them apprehension. They said, "Fear not," and gave (51:28)

Almuntakhab Fi Tafsir Alquran Alkarim

back he recoiled apprehensive and pervaded with fear, but they consoled him and in good will they said: Do not be afraid and they authoritatively made to him the intimation of the coming of a well informed and wise son who would have a sound judgment and the ability to perceive and adopt the best means for accomplishing an end

Tafseer Tafheem-ul-Quran by Syed Abu-al-A'la Maududi

(51:28) Then he became afraid of them. *26 They said: 'Fear not,' and announced to him the good news of (the birth of) a boy endowed with knowledge. *27

And he felt from them apprehension. They said, "Fear not," and gave meaning

*26) That is, "When they did not stretch out their hands for food, the Prophet Abraham became afraid in his heart. The reason for this fear could be that in tribal life the strangers' going to a house and avoiding food used to be an indication that they had come with an evil design. But most probably when they. refrained from food the Prophet Abraham realized that they were angels, who had come in human guise; and since the angels came in human guise only on extraordinary occasions, he became afraid that they must have come in that guise on some dreadful mission.
*27) According to Surah Hud: 71, this was the good news of the birth of the Prophet Isaac (peace be upon him) and this also contained the good news that through the Prophet Isaac he would have a grandson like the Prophet Jacob (peace be upon him).
 

And he felt from them apprehension. They said, "Fear not," and gave meaning in Urdu

پھر وہ اپنے دل میں ان سے ڈرا انہوں نے کہا ڈریے نہیں، اور اُسے ایک ذی علم لڑکے کی پیدائش کا مژدہ سنایا