What does the phrase “swapping horses in the middle of the stream,” mean, and who said it

"Don't change horses in midstream means don't alter your course of action, plan, or leader in the middle of a project, don't change your mind at an inopportune moment. A related phrase is don't swap horses in midstream. The proverb is credited to Abraham Lincoln, the sixteenth president of the United States" (grammarist)

Explanation:

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Lincoln said it and was referring to his disapproval of changing the presidential administration during the Civil War.

Explanation:

i had this answer on my exam and i got it right!