Which preposition to use with chirpings

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St. Eloy tells his people plainly, that whoever pays attention to what he meets at his first going out or coming in, or to any particular voice, or to the chirping of a bird, is so far a Pagan.

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My matin chirpings into mellower song.

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Even the birds in their nests, awakened by the firelight, join their sleepy chirpings to the chorus.

Which preposition to use with  chirpings