This one here is a quotation from Alf Layla wa Layla aka 1,001 Nights aka Tales of the Arabian Nights. I think it’s a generally useful sentiment: “Don’t ask about what doesn’t concern you, or you might hear what doesn’t please you.” Of course on the t-shirt it’s in Arabic, with English smaller underneath.
Another t-shirt, of which I don’t have a picture, reads in Arabic, “Death before dishonor.” This particular phrase came from a sample of pre-Islamic literature and stuck with me. In Arabic it rhymes. Once again, there’s the Arabic and then the English underneath in smaller letters.