An explanation of the problem with gambling, and the reason it pasels one for eidus is:
Mishneh Torah H’ Gezelah 6:10 (explains why misachek bikuvia is gezel).
??????? ?????? ????. ??? ??????? ????? ?? ??????? ?? ?????? ?????? ??? ?????? ???? ?????? ??? ????? ?? ????? ????? ???? ??? ???? ?? ??? ??? ?? ??? ???????. ??”? ?????? ?????? ??? ????? ???? ???? ????? ???? ??? ???? ????? ??? ?? ????. ??? ??????? ????? ?? ???? ?? ?????? ?????? ???? ??? ????? ????? ?? ???? ???? ??? ?????? ?? ??? ??? ????? ?????? ??? ??? ???? ???? ??????? ???
H’ Eidus 10:4 (this doesn’t address gambling per se, but taking money by force, usurious lending and borrowing, and several professsions that intrinsically compel dishonesty).
???? ?? ?? ????? ??? ?????? ????? ??”? ??? ??? ??????? ????? ??? ????? ????? ??????? ???? ????? ???? ???? ?????? ????? ?? ???? ?? ??? ???? ???? ?????? ???????? ?? ?? ?? ?????? ???? ????? ??? ???? ?? ??? ??? ?? ???? ??”? ????? ????? ???? ???? ??? ?? ???? ?? ????? ??? ???? ??????? ??? ???? ??? ????? ???? ??? ?? ?? ?? ??? ???? ?? ???? ???? ??? ??? ??? ???? ??? ????? ????? ??? ????? ???? ???? ????? ?????? ????? ?? ???? ????? ??? ??? ?? ?????? ?? ????? ??? ??? ???? ??? ??? ?? ?????? ??????? ??? ?? ????? ?? ??? ?? ?????? ??? ??? ???? ??????? ???? ??????? ??? ??????? ???? ?? ??????? ??? ????? ?????? ??”? ??????? ????? ??? ??? ?????? ??????? ??? ?????? ??? ???? ???? ??? ???? ???? ???? ??? ?? ???? ??? ?? ?????? ?????? ?????? ????? ???? ??????? ????? ????? ????? ??????? ?? ????? ?????? ??? ???? ???? ?????? ???? ??? ???? ????? ?????? ??? ????? ???? ????? ????? ???? ???? ??? ??”? ??? ??????? ???? ?????? ???? ?????? ???? ???? ???? ????? ??? ???? ?????? ??????? ???? ????? ??? ???? ??? ???? ???? ????? ??? ???? ????? ????? ??? ??? ??? ?? ????? ??? ????? ??? ??? ??????:
In order to Omer Dovor Beshem Omroi, this was cut-and-pasted from:
http://www.hashkafah.com/Gambling_t17489.html&mode=linear
This is NOT about kvitlach (or kfitlach, as commonly pronounced).
This is specifically about misachek bikuvia and psul eidus, as discussed above.
notpashut or anyone else – if you know where in the Mishan Berura this is discussed, I’d greatly appreciate the mekor.
The question of muttar – assur is not one to be decided based on opinion or our own logical tzugleichen (comparison).
If one is unsure, consult your LOR.
Gut Shabbos.