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?”