And they used to hew out houses in the mountains without fear.
They used to carve secure homes out of the mountains.
They hewed their dwellings out of the mountains in safety
And they hewed houses in the mountains, in security
And they were carving out/cutting from the mountains houses/homes safely/securely
They used to carve secure houses inside the mountains
And they used to carve dwellings in the hills, without fear
And they used to hew out houses in the mountains, in security
And they used to carve out houses in the mountains without any threat and fear
And they (in search of a life of peace and security,) used to hew some parts of the mountains into houses feeling secure (therein)
And they used to hew out dwellings from the mountains (feeling themselves) secure