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Naomi sued Peter under an age discrimination statute, alleging that Peter refused to hire her for a dawn loading-crew job at his private Christian retreat-supply company because she was 67. Peter's defense was that he refused to employ Naomi because he reasonably believed that she could not safely complete the physical shift. Peter seeks to testify that Ruth, Naomi's former supervisor at a hymnbook bindery, warned him not to hire Naomi because Naomi could not keep up with lifting packed hymnals onto delivery carts for an entire predawn route. The testimony of Peter is: