अन्यतरामेव वर्तनीं संस्करोति हीयतेऽन्यतरा स यथैकपाद्व्रजन्रथो वैकेन चक्रेण वर्तमानो रिष्यत्येवमस्य यज्ञोरिष्यति यज्ञं रिष्यन्तं यजमानोऽनुरिष्यति स इष्ट्वा पापीयान्भवति ॥ ४.१६.३ ॥
In plain words
he fashions only one of the tracks, and the other is neglected. And as a man walking on one foot, or a chariot running on one wheel, comes to harm, so his sacrifice comes to harm; and when the sacrifice comes to harm, the sacrificer comes to harm after it, and having sacrificed he becomes the worse for it.