on good authority

From a reliable source. I have it on good authority that Mom will take us out for ice cream if you finish your vegetables. Once that witness's story was verified, we had it on good authority that the man we'd arrested had in fact committed the crime.

See also: authority, good, on

See also:

(every) once in a while
What number are you calling from?
at variance
at variance (with)
variance
ILY
at odds with (someone or something)
at odds with someone
at odds with something
be at odds

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