phrase translation (English to Arabic)

I need someone to translate the English phrase "Strength in unity" into Arabic. I need an idiomatic translation (if it exists), rather than a literal one. That is to say, I need to capture the essence of the English phrase in Arabic. This is for a wedding band engraving, and the idea I want to convey is that by joining together (especially in joining together with people different backgrounds), we can accomplish much more.