As in रजस् - rajas (’stain’)

羅字門一切法離垢故

The syllable RA is a gateway because all things (dharmas) are free of defilement (stain, rajas रजस् )

- Kumarajiva

入洛字門，悟一切法離塵垢故

Because one enters the syllable RA and realizes all things are free of defiling dust (rajas).

- Xuanzang

囉字門一切法離諸塵染故

RA is a gateway because all things are free of all defilement / defiling dust (rajas) .

- Amoghavajra

RA is a door to the insight that all dharmas are without dirt (rajas);

- Conze

The syllable RA is an opening because of absence of impurity (rajas) of all

mental phenomena.

- Jayarava