The Prophet ﷺ said, "Whoever claims to have seen a dream which he did not see, will be ordered to make a knot between two barley grains which he will not be able to do; and if somebody listens to the talk of some people who do not like him (to listen) or they run away from him, then molten lead will be poured into his ears on the Day of Resurrection; and whoever makes a picture, will be punished on the Day of Resurrection and will be ordered to put a soul in that picture, which he will not be able to do." Ibn ʿAbbas also narrated a similar hadith.  

عَنِ النَّبِيِّ ﷺ قَالَ مَنْ تَحَلَّمَ بِحُلُمٍ لَمْ يَرَهُ كُلِّفَ أَنْ يَعْقِدَ بَيْنَ شَعِيرَتَيْنِ وَلَنْ يَفْعَلَ وَمَنِ اسْتَمَعَ إِلَى حَدِيثِ قَوْمٍ وَهُمْ لَهُ كَارِهُونَ أَوْ يَفِرُّونَ مِنْهُ صُبَّ فِي أُذُنِهِ الآنُكُ يَوْمَ الْقِيَامَةِ وَمَنْ صَوَّرَ صُورَةً عُذِّبِ وَكُلِّفَ أَنْ يَنْفُخَ فِيهَا وَلَيْسَ بِنَافِخٍ قَالَ سُفْيَانُ وَصَلَهُ لَنَا أَيُّوبُ وَقَالَ قُتَيْبَةُ حَدَّثَنَا أَبُو عَوَانَةَ عَنْ قَتَادَةَ عَنْ عِكْرِمَةَ عَنْ أَبِي هُرَيْرَةَ قَوْلَهُ مَنْ كَذَبَ فِي رُؤْيَاهُ وَقَالَ شُعْبَةُ عَنْ أَبِي هَاشِمٍ الرُّمَّانِيِّ سَمِعْتُ عِكْرِمَةَ قَالَ أَبُو هُرَيْرَةَ قَوْلَهُ مَنْ صَوَّرَ وَمَنْ تَحَلَّمَ وَمَنِ اسْتَمَعَ حَدَّثَنِي إِسْحَاقُ حَدَّثَنَا خَالِدٌ عَنْ خَالِدٍ عَنْ عِكْرِمَةَ عَنِ ابْنِ عَبَّاسٍ قَالَ مَنِ اسْتَمَعَ وَمَنْ تَحَلَّمَ وَمَنْ صَوَّرَ نَحْوَهُ  

Messenger of Allah ﷺ said, "The worst lie is that a person claims to have seen a dream which he has not seen."  

أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ مِنْ أَفْرَى الْفِرَى أَنْ يُرِيَ عَيْنَيْهِ مَا لَمْ تَرَ