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I have seen several references where certain gedolei yisroel of yesteryear, promise that if a person learns their works, these Rabbonim will be מליץ יושר (advocate) for them in the olam haemes. Examples include the following: Rav Yechezkel Abramsky zt"l about whom it is related: שנפטר בכ"ד אלול תשל