"Don’t ask how I know that." in Spanish

No preguntes cómo lo sé.

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Literal Breakdown

English	Spanish	Learn
not	no	Learn
ask	preguntes	Learn
how	cómo	Learn
it	lo	Learn
I know (1st person singular)	sé	Learn

Summary

The Spanish translation for “Don’t ask how I know that.” is No preguntes cómo lo sé.. The Spanish, No preguntes cómo lo sé., can be broken down into 5 parts:"not" (no), "ask" (preguntes), "how" (cómo), "it" (lo) and "I know (1st person singular)" (sé).