This is what the historian Herodotus says about Croesus and the Pythia:

53. The Lydians who were to bring these gifts to the temples were charged by Croesus to inquire of the oracles, "Shall Croesus send an army against the Persians: and shall he take to himself any allied host?" When the Lydians came to the places whither they were sent, they made present of the offerings, and inquired of the oracles, in these words: "Croesus, king of Lydia and other nations, seeing that he deems that here are the only true places of divination among men, endows you with such gifts as your wisdom merits. And now he would ask you, if he shall send an army against the Persians, and if he shall take to himself any allied host." Such was their inquiry; and the judgment given to Croesus by each of the two oracles was the same, to wit, that if he should send an army against the Persians he would destroy a great empire.

[...]

90. [...]
Croesus, finding his request allowed, sent certain Lydians to Delphi, enjoining them to lay his fetters upon the threshold of the temple, and ask the god, "If he were not ashamed of having encouraged him, as the destined destroyer of the empire of Cyrus, to begin a war with Persia, of which such were the first-fruits?" As they said this they were to point to the fetters -- and further they were to inquire, "If it was the wont of the Greek gods to be ungrateful?"

91.The Lydians went to Delphi and delivered their message, on which the Pythia is said to have replied - "[...] Nor has Croesus any right to complain with respect to the oracular answer which he received. For when the god told him that, if he attacked the Persians, he would destroy a mighty empire, he ought, if he had been wise, to have sent again and inquired which empire was meant, that of Cyrus or his own; but if he neither understood what was said, nor took the trouble to seek for enlightenment, he has only himself to blame for the result. [...]"

Such was the answer of the Pythia. The Lydians returned to Sardis and communicated it to Croesus, who confessed, on hearing it, that the fault was his, not the god's. Such was the way in which Ionia was first conquered, and so was the empire of Croesus brought to a close.

(Herodotus, Book I https://penelope.uchicago.edu/Thayer/E/Roman/Texts/Herodotus/1b*.html)

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