The word(s) "arm" appears 82 time(s) in 73 verse(s) in Quran in Abdullah Yusuf Ali translation.

(51) Such elderly women as are past the prospect of marriage,- there is no blame on them if they lay aside their (outer) garments, provided they make not a wanton display of their beauty: but it is best for them to be modest: and Allah is One Who sees and knows all things.

(52) Yet do they worship, besides Allah, things that can neither profit them nor harm them: and the Misbeliever is a helper (of Evil), against his own Lord!

(53) "Or do you good or harm?"

(54) "Touch her not with harm, lest the Penalty of a Great Day seize you."

(55) Behold! Moses said to his family: "I perceive a fire; soon will I bring you from there some information, or I will bring you a burning brand to light our fuel, that ye may warm yourselves.

(56) "Now put thy hand into thy bosom, and it will come forth white without stain (or harm): (these are) among the nine Signs (thou wilt take) to Pharaoh and his people: for they are a people rebellious in transgression."

(57) Now when Moses had fulfilled the term, and was travelling with his family, he perceived a fire in the direction of Mount Tur. He said to his family: "Tarry ye; I perceive a fire; I hope to bring you from there some information, or a burning firebrand, that ye may warm yourselves."

(58) "Move thy hand into thy bosom, and it will come forth white without stain (or harm), and draw thy hand close to thy side (to guard) against fear. Those are the two credentials from thy Lord to Pharaoh and his Chiefs: for truly they are a people rebellious and wicked."

(59) He said: "We will certainly strengthen thy arm through thy brother, and invest you both with authority, so they shall not be able to touch you: with Our Sign shall ye triumph,- you two as well as those who follow you."

(60) O Prophet! Tell thy wives and daughters, and the believing women, that they should cast their outer garments over their persons (when abroad): that is most convenient, that they should be known (as such) and not molested. And Allah is Oft-Forgiving, Most Merciful.