What is the ruling on hanging the phrase: "Labbaik, O Messenger of Allah"?

Question:
May Allah reward you, Honorable Shaykh. A questioner says: There are some stickers on shops that read "Labbaik, O Messenger of Allah." Is this phrase permissible? Is it shirk (associating partners with Allah)? And what is obligatory for us regarding it?

Answer:
"Labbaik" is for Allah the Exalted: "Labbaik, O Allah, Labbaik, Labbaik, there is no partner for You." As for "Labbaik, O Messenger of Allah," if the Messenger (peace and blessings be upon him) were to call you, if the Messenger (peace and blessings be upon him) were to call you and say, "O so-and-so," you would say, "Labbaik, O Messenger of Allah," just as the Companions (may Allah be pleased with them) used to say, "Labbaik, O Messenger of Allah," when he called them. But after his death, do not say "Labbaik, O Messenger of Allah"; say "Labbaik, O Allah, Labbaik." Yes.