﴿ وَلَقَدْ جَآءَكُمْ يُوسُفُ مِن قَبْلُ بِٱلْبَيِّنَٰتِ فَمَا زِلْتُمْ فِى شَكٍّۢ مِّمَّا جَآءَكُم بِهِۦ ۖ حَتَّىٰٓ إِذَا هَلَكَ قُلْتُمْ لَن يَبْعَثَ ٱللَّهُ مِنۢ بَعْدِهِۦ رَسُولًۭا ۚ كَذَٰلِكَ يُضِلُّ ٱللَّهُ مَنْ هُوَ مُسْرِفٌۭ مُّرْتَابٌ ﴾

““And [remember:] it was to you that Joseph came aforetime with all evidence of the truth; but you never ceased to throw doubt on all [the messages] that he brought you - so much so that when he died, you said, ‘Never will God send any apostle [even] after him!’ “In this way God lets go astray such as waste their own selves by throwing suspicion [on His revela­tions] –”

Please check ayah 40:35 for complete tafsir.