{Abideth} (menei). Present active indicative, continues in
the light and so does not interrupt the light by hating his
brother. {Occasion of stumbling} (skandalon). See on 烘t 13:41;
16:23| for this interesting word. It is a stumbling block or trap
either in the way of others (its usual sense), as in  Mt 18:7 ,
or in one's own way, as is true of proskopt(935c) in  Joh 11:9  and
in verse  11  here. But, as Westcott argues, John may very well
have the usual meaning here and the other in verse  11 .