Surah Saba Verse 18


وَجَعَلْنَا بَيْنَهُمْ وَبَيْنَ الْقُرَى الَّتِي بَارَكْنَا فِيهَا قُرًى ظَاهِرَةً وَقَدَّرْنَا فِيهَا السَّيْرَ
سِيرُوا فِيهَا لَيَالِيَ وَأَيَّامًا آمِنِينَ

“We placed, between them and the towns which We had blessed, (other) towns easy to be seen, and made the stages of journey between them easy, (saying): Travel between them in safety by day or by night”

While explaining the above verse, Imam Sadiq (as) said, this verse refers to travelling at the time of our Qaem (as) the Ahlul Bayt. (Elalush Sharae volume 1 page 112)