Praying and taking out a paper and pen and writing something to remember it, does this invalidate his prayer?

Question : A man has a pen with him. He had forgotten his memorized texts, so when he entered the prayer, he memorized them, and the exam is coming up soon. Let us say he is praying in the college mosque and has no references, so he remembered a passage of five lines, took out the paper, and began writing it down while praying because he was afraid that if he finished his prayer, he would forget it. What do you say about this?

Answer : Is that a lot? Yes, that is a lot. But if it were one or two words, that is trivial. If he needs to do that, there is no harm, because there is no harm in doing so in prayer as well. Sometimes a person has an urgent matter that he must remember. When a person enters prayer, Satan comes to him and says, "Remember this, remember that," things he was not remembering, until he remembers them. He does this out of mercy for him, always, but to ruin his worship. He loves to distract him from his worship so that the prayer remains a body without a spirit.