al-Walid bin 'Abdullah الوليد بن عبد الله بن أبي مغيث · Knowledge (Kitab Al-Ilm)

The Messenger of Allah (ﷺ) ordered me (to learn the writing of the Jews), so I learnt for him the writing of the Jews. He said: I swear by Allah, I do not trust Jews in respect of writing for me. So I learnt it, and only a fortnight passed before I mastered it. I would write for him when he wrote (to them), and read to him when something was written to him.