the horse's mouth

"Gregg told me those people have a dreadful life. 'We're doing good', he told me. That was from the horse's mouth, so I won't let anyone tell me we shouldn't have been there."

“People might think this is a better forum in which to get, from the horse’s mouth, what the different presidential tickets actually stand for.”

He took a deep breath and held the bridle out between his hands, then thrust it at the horse’s mouth.

Republicans are concerned they have few accomplishments to run on in 2024, and according to NBC News, it's coming from the horse's mouth.

"Anthony, you're getting it from the horse's mouth himself: I'm here, I'm ready to go," Wilder said.