Al-Kāfi - Volume 4 > Disciplines During Fasting
Hadith #10

10ـ عَلِيُّ بْنُ إِبْرَاهِيمَ عَنْ أَبِيهِ عَنِ ابْنِ أَبِي عُمَيْرٍ عَنْ مَنْصُورِ بْنِ يُونُسَ عَنْ أَبِي بَصِيرٍ قَالَ سَمِعْتُ أَبَا عَبْدِ الله (عَلَيْهِ السَّلاَم) يَقُولُ الْكَذِبَةُ تَنْقُضُ الْوُضُوءَ وَتُفَطِّرُ الصَّائِمَ قَالَ قُلْتُ هَلَكْنَا قَالَ لَيْسَ حَيْثُ تَذْهَبُ إِنَّمَا ذَلِكَ الْكَذِبُ عَلَى الله عَزَّ وَجَلَّ وَعَلَى رَسُولِهِ وَعَلَى الأَئِمَّةِ ع.

10. Ali ibn Ibrahim has narrated from his father from ibn abu ‘Umayr from Mansur ibn Yunus from abu Basir who has said the following: “I heard abu ‘Abd Allah, ‘Alayhi al-Salam, say, ‘Speaking lies invalidates Wudu’ and fasting.’ I (the narrator) then said, ‘We are destroyed.’ He (the Imam) said, ‘It is not the way you think it is. It means speaking lies against Allah, the Most Majestic, the Most Glorious, His Messenger and ’A’immah, ‘Alayhim al-Salam.’”