The exchange between the two athletes seems to have started with Bell retweeting an image that talked about Harper's reported new contract with the Phillies. Bell then added to that image a comment that both congratulated Harper and tagged the slugger.
A later screenshot in Bell's Instagram story shows what appears to be a private conversation between him and Harper. In that conversation Harper says, "Aye come join! Let's take this city by storm. Bring as many titles as we can to the greatest city in the world. Brotherly Love. #SecureTheBag."
Harper is a Dallas Cowboys fan and has previously not had an issue supporting his own rooting interests, even if it put him at odds with his former fan base in Washington, D.C.