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?'