Surah Saba 34:18

وَجَعَلْنَا بَيْنَهُمْ وَبَيْنَ ٱلْقُرَى ٱلَّتِى بَـٰرَكْنَا فِيهَا قُرًى ظَـٰهِرَةً وَقَدَّرْنَا فِيهَا ٱلسَّيْرَ ۖ سِيرُوا۟ فِيهَا لَيَالِىَ وَأَيَّامًا ءَامِنِينَ

And We placed between them and the cities which We had blessed [many] visible cities. And We determined between them the [distances of] journey, [saying], "Travel between them by night or by day in safety."

Translation: Saheeh International

Tafsir

And We set between them between Sheba who were in Yemen and the towns which We had blessed with abundance of water and trees — these being the towns of Syria to which they used to travel for commerce — prominent towns continuous along the route from Yemen to Syria and We facilitated for travellers the journeying …

Excerpt from Tafsir al-Jalalayn, commentary on 34:18, via Quran.com. The reader has the full commentary and 9 more tafsirs.