Q: Lectors say: “The Word of the Lord” at reading conclusion. Others say: “The Word of God”. Please clarify the correct response and why. Thank you
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A: The dialogue was introduced into the Mass right after the Second Vatican Council to give the people an active response to the proclamation of the readings. In Latin, the first part has always been _Verbum Domini_, literally translated as “The Word of the Lord.”
Some readers in some communities may have changed this on their own authority to “The Word of God” in order to avoid a gender-specific allusion to God. (“Lord” is indisputably masculine.)
But if you’re asking what does the missal state, there’s no question: It’s “The Word of the Lord.”