Then whoever argues with you about it after [this] knowledge has come (3:61)

Almuntakhab Fi Tafsir Alquran Alkarim

Should any one contend with you about ‘Isa with opposing arguments, the fact shall destroy the fiction. Now that you know the facts, say to them Come, let us summon our sons and your sons, our women and your women and ourselves and yourselves and pray Allah and beseech Him to accurse those who intentionally assert falsehood

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

(3:61) Tell whoever disputes with you on this matter after true knowledge has come to you: 'Come! Let us summon our sons and your sons, and our women and your women, and ourselves and yourselves, and then let us pray together and invoke the curse of Allah on those who lie.' *55

Then whoever argues with you about it after [this] knowledge has come meaning

*55). The real aim in suggesting this procedure for deciding the dispute was to prove that the attitude of those amongst the delegation of Najran was one of deliberate stubbornness and intransigence. They had no sound arguments to contradict any of the points mentioned above, and they could not find any shred of evidence in their own scriptures upon which they could claim, with firm conviction, that their beliefs were true. Moreover, all that the members of the deputation had come to know of the character, teachings and achievements of the Prophet had made them more or less convinced of his prophethood, and at least caused their disbelief to waver. When they were told that if they had full confidence in the truth of their beliefs they should come forward and pray to God that His curse should fall on the deniers of the truth, none of them came forward. It thus became clear all over Arabia that the priests and leaders of Christianity in Najran, whose holiness was celebrated far and wide, followed beliefs, the truth of which, they themselves were not fully confident in.
 

Then whoever argues with you about it after [this] knowledge has come meaning in Urdu

یہ علم آ جانے کے بعد اب کوئی اس معاملہ میں تم سے جھگڑا کرے تو اے محمدؐ! اس سے کہو، "آؤ ہم اور تم خود بھی آ جائیں اور اپنے اپنے بال بچوں کو بھی لے آئیں اور خد ا سے دعا کریں کہ جو جھوٹا ہو اُس پر خدا کی لعنت ہو"