﴿ قَالَ إِنِّى لَيَحْزُنُنِىٓ أَن تَذْهَبُوا۟ بِهِۦ وَأَخَافُ أَن يَأْكُلَهُ ٱلذِّئْبُ وَأَنتُمْ عَنْهُ غَٰفِلُونَ ﴾

“[Jacob] answered: "Behold, it grieves me indeed [to think] that you might take him with you, for I dread lest the wolf devour him at a moment when you are heedless of him!"”

Please check ayah 12:14 for complete tafsir.