The stranger - They who sojourned among Israel, though they were not of Israel, were bound to abstain from idol-worship Leviticus 17:10; Leviticus 20:2.
By myself - Or, as in Ezekiel 14:4, “according to” Myself. He who comes to inquire with a heart full of idolatry shall have his answer,
(1) “according to the multitude of his idols” - in delusion,
(2) “according to the holiness of God” - in punishment.
The inquiry was hypocritical and unreal - but God will answer not by the mouth, but by the hand, not by word but by deed, not by speech but by a scourge.