Edited for clarity:
The question providing a source to the prohibition of eating and drinking while standing has been discussed here and in subsequent links. In both posts phenomenal sources were given to support halachically where this minhag/halacha originates. But my question is where from the Torah do we find this?
Shemos Rabbah 20:18 discusses the cognitive relationship of ויסב as הסיבה reclining (Maharzu). The following is derived from Toldos Noach, Beur Maharif, Eitz Yosef:
When the people were freed they had the opportunity to recline while dining, unlike slaves who must eat while standing on their feet or walking from place to place.
Does anyone use the historical behavior of slaves as a source for this minhag (derived from the Torah)? Do we not stand while eating/drinking to remember yetziat mitzrayim?