بيْنَ الْحَقِّ وَالْباطِلِ أرْبَعُ أصابِع، ما رَأَيْتَ بَعَيْنِکَ فَهُوَ الْحَقُّ وَ قَدْ تَسْمَعُ بِأُذُنَيْکَ باطِلاً کَثيرا
Imam Mojtaba (AS): There is a distance of four fingers between truth and falsehood, what you see with your own eyes is truth; and what you have heard or what has been narrated to you may be false.
Tuhaf al-uqul: 229.
source : erfan.ir