Narada Purana (Jyotisha Selections) · by Vyasa
Chapter 10 · Yatra and Omens
यात्रा शकुनाश्च
विलोमगो ग्रहो यस्य यात्रालग्नोपगो यदि ।तस्य भङ्गप्रदो राज्ञस्तद्वर्गोऽपि विलग्नगः ॥ ६३३ ॥
In the full Narada Purana (Purva Bhaga) this is chapter 56, verse 633.
If a planet moving backward joins the rising sign of the journey, it can break the king's journey. Its division in the lagna (rising sign) can do the same.
Simple meaning: A planet moving backward in the rising sign of the journey can break the journey.
रवींद्वयनयोर्यातमनुकूलं शुभप्रदम् ।
Travel when the Sun's and Moon's courses suit the direction. If not, use day or night, or life may be at risk.
मूढे शुक्रे कार्यहानिः प्रतिशुक्रे पराजयः ।
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.