The Arabic word for four is أَرْبَعَة (arba'ah).. This word appears 7 times in the Quran.

47x
4️⃣

أَرْبَعَة

arba'ah

four

تُطْلَبُ أَرْبَعَةُ شُهَدَاءَ.

Four witnesses are required.