The word(s) "observed" appears 5 time(s) in 5 verse(s) in Quran in Saheeh International translation.

(1) And We sent not before you [as messengers] except men to whom We revealed from among the people of cities. So have they not traveled through the earth and observed how was the end of those before them? And the home of the Hereafter is best for those who fear Allah; then will you not reason?

(2) Have they not traveled through the earth and observed how was the end of those before them? They were greater than them in power, and they plowed the earth and built it up more than they have built it up, and their messengers came to them with clear evidences. And Allah would not ever have wronged them, but they were wronging themselves.

(3) Have they not traveled through the land and observed how was the end of those before them? And they were greater than them in power. But Allah is not to be caused failure by anything in the heavens or on the earth. Indeed, He is ever Knowing and Competent.

(4) Have they not traveled through the land and observed how was the end of those who were before them? They were greater than them in strength and in impression on the land, but Allah seized them for their sins. And they had not from Allah any protector.

(5) Have they not traveled through the land and observed how was the end of those before them? They were more numerous than themselves and greater in strength and in impression on the land, but they were not availed by what they used to earn.