Full greeting of Ahlan Wa Sahlan أهلاً وسهلاً

We all know the greeting أهلاً وسهلاً . The full form, or origin of it, seems to be from two varieties.

حللتَ أهلاً ونزلتَ سهلاً
Arrive as family and stay (come down) with ease.

حللتَ أهلاً ووطئتَ سهلاً
Arrive as family and tread with ease.