كَانَ عَلِيُّ بْنُ الْحُسَيْنِ صَلَوَاتُ اللَّهِ عَلَيْهِمَا يَقُولُ لِوُلْدِهِ: اتَّقُوا الْكَذِبَ الصَّغِيرَ مِنْهُ وَ الْكَبِيرَ فِي كُلِّ جِدٍّ وَ هَزْلٍ؛ فَإِنَّ الرَّجُلَ إِذَا كَذَبَ فِي الصَّغِيرِ اجْتَرى عَلَى الْكَبِيرِ.
Imam Ja‘far al-Ṣadiq (as):
Imam Zayn al-Abidin (AS) would often say to his children, 'Be cautious of lies, both big and small, whether seriously and in jest, for when a man tells a lie about a trivial matter, he will have the audacity to tell a big lie.'
Source:
al-Kāfī
Vol4
P41
ID: 16938