Narada Purana (Jyotisha Selections) · by Vyasa
Chapter 10 · Yatra and Omens
यात्रा शकुनाश्च
मूढे शुक्रे कार्यहानिः प्रतिशुक्रे पराजयः ।प्रतिशुक्रकृतं दोषं हंतुं शक्ता ग्रहा न हि ॥ ६३५ ॥
In the full Narada Purana (Purva Bhaga) this is chapter 56, verse 635.
When Venus is set, work may be lost. With pratishukra (Venus standing in front of the traveler), the traveler may face defeat. The planets cannot cancel the fault made by pratishukra.
Simple meaning: Venus set can bring loss of work. Venus in front of the traveler can bring defeat, and nothing cancels it.
वासिष्ठकाश्यपेयात्रिभारद्वाजाः सगौतमाः ।
These five clan lines have no fault of Venus in front.
एकग्रामे विवाहे च दुर्भिक्षे राजविग्रहे ।
This Venus fault does not count in these cases.
नीचगोऽरिगृहस्थो वा वक्रगो वा पराजितः ।
Venus low, in an enemy's house, backward or beaten can break the journey. Venus high brings victory.