Tried and true

Tried and true is an idiom with an uncertain origin. An idiom is a commonly used word, group of words, or phrase that has a figurative meaning that is not easily deduced from its literal definition. Often using descriptive imagery or metaphors, common idioms are words and phrases used in the English language in order […]
from Grammarist
https://grammarist.com/idiom/tried-and-true/