ما أصل مقولة: "خليت كل السنن وجيت على هذي"؟

The phrase in question might be understood as a reproach directed at someone who performs a Sunnah but limits themselves to it. This reproach is permissible if it falls under the category of enjoining truth and encouraging good. It might also be understood as a reproach from someone who has an issue with this particular Sunnah, blaming its performer by saying: "Is this the only Sunnah left for you [to perform]?" This type of reproach is not appropriate because it discourages performing good deeds.