When Sita was in Ashoka vatika, she praised Vibhishana along with Malyavaan and Asumbana. This appears in Sundar Kand (not clear under which sarga). I was able to find a site which hosts English translation:

Is there no saint or learned person in this country who can advice you and put you in right path. I can't say like that, considering the fact great people like Vibhishana, Asumbanan, Malyavan are residing here. Don’t you listen to them. Do not ignore the words of learned people and indulge in a sinful activity. You are paving way for destruction of yourself and your country.

What are those good deeds performed by the duo who was in par with Vibhishana in the mind of Sita?

When Sita was in Ashoka vana, she praised Vibhishana along with Malyavaan and Asumbana. This appears in Sundar Kand (not clear under which sarga). I was able to find a site which hosts English translation:

Is there no saint or learned person in this country who can advice you and put you in right path. I can't say like that, considering the fact great people like Vibhishana, Asumbanan, Malyavan are residing here. Don’t you listen to them. Do not ignore the words of learned people and indulge in a sinful activity. You are paving way for destruction of yourself and your country.

What are those good deeds performed by the duo who was in par with Vibhishana in the mind of Sita?

When Seetha is in Ashoka vana, she praises Vibheeshana along with Malyavaan and Asumbana. This appears in Sundara Ghandam (not clear under which sargha). I was able to find a site which hosts English translation:

Is there no saint or learned person in this country who can advice you and put you in right path. I cant say like that  , considering the fact great people like Vibhishanan, Asumbanan, Malyavan are residing here. Don’t you listen to them. Do not ignore the words of learned people and indulge in a sinful activity. You are paving way for destruction of yourself and your country”

What are those good deeds performed by the duo who was in par with Vibheeshana in the mind of Seetha?

When Sita was in Ashoka vatika, she praised Vibhishana along with Malyavaan and Asumbana. This appears in Sundar Kand (not clear under which sarga). I was able to find a site which hosts English translation:

Is there no saint or learned person in this country who can advice you and put you in right path. I can't say like that, considering the fact great people like Vibhishana, Asumbanan, Malyavan are residing here. Don’t you listen to them. Do not ignore the words of learned people and indulge in a sinful activity. You are paving way for destruction of yourself and your country.

What are those good deeds performed by the duo who was in par with Vibhishana in the mind of Sita?