The word(s) "back" appears 161 time(s) in 150 verse(s) in Quran in Mohsin Khan translation.

(91) "And throw down your stick!" But when he saw it moving as if it were a snake, he turned in flight, and did not look back. (It was said:) "O Musa (Moses)! Fear not: verily the Messengers fear not in front of Me.

(92) "Go you with this letter of mine, and deliver it to them, then draw back from them, and see what (answer) they return."

(93) [Then Sulaiman (Solomon) said to the chief of her messengers who brought the present]: "Go back to them. We verily shall come to them with hosts that they cannot resist, and we shall drive them out from there in disgrace, and they will be abased."

(94) Verily, you cannot make the dead to hear nor can you make the deaf to hear the call (i.e. benefit them and similarly the disbelievers), when they flee, turning their backs.

(95) And We inspired the mother of Musa (Moses): (telling): "Suckle him [Musa (Moses)], but when you fear for him, then cast him into the river and fear not, nor grieve. Verily, We shall bring him back to you, and shall make him one of (Our) Messengers." [Tafsir Al-Qurtubi]

(96) And when he arrived at the water (a well) of Madyan (Midian) he found there a group of men watering (their flocks), and besides them he found two women who were keeping back (their flocks). He said: "What is the matter with you?" They said: "We cannot water (our flocks) until the shepherds take (their flocks). And our father is a very old man."

(97) So he watered (their flocks) for them, then he turned back to shade, and said: "My Lord! truly, I am in need of whatever good that You bestow on me!"

(98) "And throw your stick!" But when he saw it moving as if it were a snake, he turned in flight, and looked not back. (It was said:) "O Musa (Moses)! Draw near, and fear not. Verily, you are of those who are secure.

(99) Verily, He Who has given you (O Muhammad صلى الله عليه وسلم) the Qur'an (i.e. ordered you to act on its laws and to preach it to others) will surely bring you back to Ma'ad (place of return, either to Makkah or to Paradise after your death). Say (O Muhammad صلى الله عليه وسلم): "My Lord is Aware of him who brings guidance, and of him who is in manifest error."

(100) "You worship besides Allah only idols, and you only invent falsehood. Verily, those whom you worship besides Allah have no power to give you provision: so seek your provision from Allah (Alone), and worship Him (Alone), and be grateful to Him. To Him (Alone) you will be brought back.