Valmiki Ramayana Yuddha Kanda Sarga 16 Shloka 2
Original Shlokaवसेत्सहसपत्नेनक्रुद्धेऽनाशीविषेणवा । नतुमित्रप्रवादेनसंवसेच्छत्रुसेविना ।।6.16.2।।
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सपत्नेनसह: with known enemy, वसेत् can live with, कृद्धेन: angry, अशीविषेणच: even with venomous serpent, मित्रप्रवादेन: professing to be a friend, शत्रुणासहतु: devoted to enemy, नसंवसेत् cannot stay together.
"One can live with a known enemy or even with an angry and venomous serpent but cannot stay together with one who professes to be a friend and devoted to an enemy."