And those who guard their private parts.
They keep their chastity.
who guard their private
And those who restrain their sexual passions
And those who to their genital parts (they are) protecting/guarding
The patient ones are those who do not engage in sexual activities except…
And those who protect their private organs (from adultery)
And those who guard their private parts
And those who safeguard their private parts
(Different as well is the case of) those who guard their private parts (by restraining their passions)
And those who guard their chastity (i.e. private parts from illegal sexual acts)