Ataovy fihavanam-bava sy tanana: raha marary ny tanana mitsoka ny vava, ary raha marary ny vava manafosafo ny tanana
Be like the mouth and the hand: when the hand is hurt the mouth blows on it, when the mouth is hurt the hand rubs it.
The mouth and the hand never trade places, but each shows up for the other automatically whenever there's pain to tend to. This proverb holds that same automatic, unasked mutual care up as the model for how people ought to treat each other.