The song "Hail Mary (Ja Rule Diss)" by Eminem (ft. 50 Cent and Busta Rhymes) is a diss track aimed at rapper Ja Rule. Eminem and his collaborators use the verses of the song to criticize Ja Rule for his lack of authenticity and his tendency to borrow from the styles and lyrics of other rappers, specifically Tupac Shakur.

The opening lines pay homage to Tupac, with Eminem referring to him by his stage name Makaveli, and add in the diss towards Irv Gotti, the CEO of Murder Inc., who Ja Rule was a part of. They accuse Ja Rule of being emotionally unstable due to his drug use and becoming a poor imitation of Tupac, using his style and lyrics without giving credit.

In the first verse, Eminem further criticizes Ja Rule for his lack of authenticity and accuses him of stealing lyrics from Tupac. He also addresses Ja Rule directly, mocking him for praying to God and hoping no one is listening. Eminem suggests he is not being taken seriously in the rap world and is looking for attention by mentioning other rappers' names.

In the second verse, 50 Cent chimes in and accuses Ja Rule of being a fake gangster with no credibility or talent. He references Ja Rule's legal troubles and suggests that he is being supported by his "bitches" who bring him money and drugs.

In the final verse, Busta Rhymes jumps in and adds his own criticisms of Ja Rule, suggesting that he is a fraud who is only trying to profit off of the fame and style of Tupac. He also takes issue with Ja Rule's recent attempt to beef with him and calls him out for not respecting the code of the streets.

Overall, "Hail Mary (Ja Rule Diss)" is a scathing attack on Ja Rule's credibility and talent as a rapper. Eminem, 50 Cent, and Busta Rhymes all take turns ridiculing Ja Rule's attempts to copy Tupac's style and suggest that he will never measure up to his legacy. The song represents a classic example of a diss track, with Eminem and his collaborators using their skills to undermine and belittle their opponent in the rap industry.