It is implied that a person who claims to be without sin would be calling God a liar since he said that everyone is a sinner. Alternate translation: "it is the same as calling God a liar, because he said we have all sinned" (See: [[rc://en/ta/man/translate/figs-explicit]])
"Word" here is a metonym for "message." Obeying and honoring God's word is spoken of as if his word were inside the believers. Alternate translation: "we do not understand God's word and do not obey what he says" (See: [[rc://en/ta/man/translate/figs-metaphor]] and [[rc://en/ta/man/translate/figs-metonymy]])
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