The claim that the Dallas Cowboys announced an agreement to acquire Jahmyr Gibbs but he refused, saying, “The Lions are my home, don’t think that for…millions of dollars I will betray…” does not appear in the search results. The available information shows the following:
Gibbs mentioned in interviews that he knew the Dallas Cowboys were interested and might have drafted him if he was still available at their 26th pick.
Despite the Cowboys’ interest, Gibbs clearly prefers Detroit and has expressed happiness about being a Lion
He has also stated that he didn’t want to be drafted by a cold weather team but is glad to be in Detroit, which plays in a dome.
There is no verified news that Dallas officially announced an agreement to acquire him that he refused, nor a direct quote as mentioned in the query.
Instead, Gibbs’ comments have reflected his loyalty and satisfaction with the Detroit Lions, and he has dismissed going to the Cowboys despite their interest.

Therefore, the specific report about Dallas announcing an acquisition that Gibbs refused, with the quoted statement, does not appear to be accurate or from confirmed sources. Jahmyr Gibbs is currently committed to the Detroit Lions and has publicly shown loyalty to the team.