How to say "sin" in Arabic
CognateMeaningsin
Arabic · Modern Standard Arabic
خَطِيئَة
khaṭīʾaח'טיאה
خطيئة
Hebrew · Modern Hebrew
חטא
khetخِت
How the two words are related
Cognate
Same Semitic root, same meaning — you already know this word.
Arabic root
خ-ط-أHebrew root
ח-ט-אHebrew ח-ט-א matches Arabic kh-ṭ-ʾ (Hebrew ח often answers Arabic خ, as in חמש/khams). Both roots mean "to miss the mark": Arabic khaṭaʾ is a mistake, just like Hebrew החטיא את המטרה.
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In a phrase
اِرْتَكَبَ خَطِيئَة
irtakaba khaṭīʾaארתכב ח'טיאהHe committed a sin.
Plural
خَطَايَا
khaṭāyāח'טאיאirregular plural CaCāyā — the usual pattern for such nouns, like هَدِيَّة→هَدَايَا