2 Kings 11:3

And he was with her i.e. With his nurse, who continued to tend him after he had grown somewhat older.

in the house of the Lord We learn from the description of Solomon's temple (see note on 1 Kings 6:5) that it was surrounded on two sides and one end with three stories of chambers. It is not said to what use they were put, but we may safely conclude that they were under the control of the high-priest, and that, for such a purpose as is here described, he would have no scruple about using them, even if on ordinary occasions no one dwelt in them.

six years Perhaps Athaliah was not aware that any one of the royal children had been saved. She gave order for their destruction, and her agents did all they could to carry out her design. Perhaps when they could not find Joash some other slain babe was substituted, and Athaliah would know no difference. The house of the Lord was not a place in which she herself was likely to be interested, and if the rooms around it were never as a rule used for dwelling-rooms suspicion would not be directed to them, and so they would go unsearched.

And Athaliahdid reign R.V. reigned. As in Chronicles.