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Rabbi Slifkin wrote in a recent post that: ... in some Chabad chosson/kallah classes, they are taught that during climax, they should visualize the Rebbe. Slifkin brings the writings of Rabbi Teberdovich (spelling?) as a source who writes: בשעת מעשה ראוי שלא לדבר אלא לחשוב אותיות התו...