Zayd ibn Aslam reported from his father that 'Umar used to say
on the minbar, "O people! Improve your homes but be careful about these
house snakes before they make you afraid. Those
among them which are Muslim will not be clear to you and, by Allah, we
have not made peace with them since the time when we treated them as an
enemy."
In commenting on the words of Allah Almighty, "Anything you
spend will be replaced by Him. and He is the best of Providers," (34:39)
Ibn 'Abbas said, "without extravagance or parsimony."