﴿ قَالُوا۟ نُرِيدُ أَن نَّأْكُلَ مِنْهَا وَتَطْمَئِنَّ قُلُوبُنَا وَنَعْلَمَ أَن قَدْ صَدَقْتَنَا وَنَكُونَ عَلَيْهَا مِنَ ٱلشَّٰهِدِينَ ﴾

“Said they: "We desire to partake thereof, so that our hearts might be set fully at rest, and that we might know that thou hast spoken the truth to us, and that we might be of those who bear witness thereto!"”

Please check ayah 5:115 for complete tafsir.