Correct
失之毫厘，谬以千里
/ shī zhī háo lí, miù yǐ qiān lǐ /
Strokes
Definition
a tiny lapse can lead to a huge mistake (idiom); a minor discrepancy leading to enormous losses
Example
Definition
an error the breadth of a single hair can lead you a thousand li ―a small discrepancy leads to a great error