Is it permissible to say “Let Allah work through you and trust Him”
Although the speaker of these words (mentioned in the question) intended nothing but good (that is, to invite people to put their trust in Allah and rely on Him, and not be worried and distressed), what is required of the individual is to observe proper etiquette when addressing the Lord of the Worlds and speaking of Him, and he should take care to speak of Allah, may He be exalted, in words that are appropriate to His greatness, majesty and perfection.
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