The Quran

Preface

وَإِذ قالَت طائِفَةٌ مِنهُم يا أَهلَ يَثرِبَ لا مُقامَ لَكُم فَارجِعوا ۚ وَيَستَأذِنُ فَريقٌ مِنهُمُ النَّبِيَّ يَقولونَ إِنَّ بُيوتَنا عَورَةٌ وَما هِيَ بِعَورَةٍ ۖ إِن يُريدونَ إِلّا فِرارًا

Ali Quli Qarai

And when a group of them said, ‘O people of Yathrib! [This is] not a place for you,¹ so go back!’² And a group of them sought the Prophet’s permission, saying, ‘Our homes lie exposed³ [to the enemy],’ although they were not exposed. They only sought to flee.

That is, there is no chance of your withstanding the army of the polytheists.
That is, return to your earlier creed, or go back to your homes.
Or ‘unprotected.’