Ayah

Word by Word
إِذۡ
When
دَخَلُواْ
they entered
عَلَيۡهِ
upon him
فَقَالُواْ
and said
سَلَٰمٗا
Peace
قَالَ
He said
إِنَّا
Indeed we
مِنكُمۡ
(are) of you
وَجِلُونَ
afraid
إِذۡ
When
دَخَلُواْ
they entered
عَلَيۡهِ
upon him
فَقَالُواْ
and said
سَلَٰمٗا
Peace
قَالَ
He said
إِنَّا
Indeed we
مِنكُمۡ
(are) of you
وَجِلُونَ
afraid
Translation

When they entered his presence and said, "Peace!" He said, "We feel afraid of you!"
Tafsir

[how] when they entered unto him, and said, 'Peace!', that is, [they said] this very word (salaam). He, Abraham, said, after having offered them food which they did not eat: 'Lo! we are afraid of you'.
"
The Guests of Ibrahim and their Good News of a Son for Him
Allah says:
وَنَبِّيۡهُمۡ عَن
And tell them about,
Allah is saying:`Tell them, O Muhammad, about the story of,
ضَيۡفِ إِبۡراَهِيمَ
إِذۡ
.
the guests of Ibrahim. When,
دَخَلُواۡ عَلَيۡهِ فَقَالُواۡ سَلمًا قَالَ إِنَّا مِنكُمۡ وَجِلُونَ
they entered upon him, and said:""Salaman (peace!).""
He said:""Indeed we are frightened of you.""
meaning that they were scared. The reason for their fear has been mentioned previously, which is that they noticed that these guests did not eat of the food that was offered, which was a fattened calf.
قَالُواۡ لَا تَوۡجَلۡ
They said:""Do not be afraid!...""
meaning, do not be scared.
إِنَّا نُبَشِّرُكَ بِغُلمٍ عَلِيمٍ
We bring you the good news of a boy possessing much knowledge and wisdom.
this refers to Ishaq, as was previously mentioned in Surah Hud. Then,
قَالَ
He said,
meaning he spoke with wonder and astonishment, asking for confirmation, because he was old and his wife was old:
أَبَشَّرۡتُمُونِي عَلَى أَن مَّسَّنِيَ الۡكِبَرُ فَبِمَ تُبَشِّرُونَ
Do you give me this good news while old age has overtaken me! Of what then is your news about!
They responded by confirming the good news they had brought, good news after good news:
قَالُواۡ بَشَّرۡنَاكَ بِالۡحَقِّ فَلَ تَكُن مِّنَ الۡقَانِطِينَ
They said:""We give you good news in truth. So do not be of those who despair.""
قَالَ وَمَن يَقۡنَطُ مِن رَّحۡمَةِ رَبِّهِ إِلاَّ الضَّألُّونَ
He said:""And who despairs of the mercy of his Lord except those who are astray!"
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