The Crow And Mercury
A Crow caught in a snare prayed to Apollo to release him, making a
 vow to offer some frankincense at his shrine. But when rescued from
 his danger, he forgot his promise. Shortly afterwards, again caught
 in a snare, he passed by Apollo and made the same promise to offer
 frankincense to Mercury. Mercury soon appeared and said to him, "O
 thou most base fellow? how can I believe thee, who hast disowned and
 wronged thy former patron?' 
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