Hid then with the stalks of flax - It is a matter of little consequence whether we translate פסתי העיץ pistey haets stalks of flax, or stalks of hemp: the word עץ ets, which signifies wood, serves to show that whether it was hemp or flax, it was in its rough, unmanufactured state; and as this was about the season, viz., the end of March or the beginning of April, in which the flax is ripe in that country, consequently Rahab's flax might have been recently pulled, and was now drying on the roof of her house. The reader may find some useful remarks upon this subject in Harmer's Observations, vol. iv., p. 97, etc.

Upon the roof - We have already seen that all the houses in the east were made flat-roofed; for which a law is given Deuteronomy 22:8. On these flat roofs the Asiatics to this day walk, converse, and oftentimes even sleep and pass the night. It is probable that this hiding was after that referred to in the fourth verse.

Joshua 2:7 So the men pursued them on the road to the Jordan to the fords; and as soon as those who were pursuing them had gone out, they shut the gate.

Joshua 2:9 and said to the men, "I know that the LORD has given you the land, and that the terror of you has fallen on us, and that all the inhabitants of the land have melted away before you.

Hope for the Heathen
Throughout his ministry Isaiah bore a plain testimony concerning God's purpose for the heathen. Other prophets had made mention of the divine plan, but their language was not always understood. To Isaiah it was given to make very plain to Judah the truth that among the Israel of God were to be numbered many who were not descendants of Abraham after the flesh. This teaching was not in harmony with the theology of his age, yet he fearlessly proclaimed the messages given him of God and brought hope …
Ellen Gould White—The Story of Prophets and Kings