The word(s) "observe" appears 49 time(s) in 47 verse(s) in Quran in Muhammad Pickthal translation.

(31) Is it not a guidance for them (to observe) how many generations We destroyed before them, amid whose dwelling places they do walk? Lo! therein verily are portents! Will they not then heed?

(32) Have they not observed what is before them and what is behind them of the sky and the earth? If We will, We can make the earth swallow them, or cause obliteration from the sky to fall on them. Lo! herein surely is a portent for every slave who turneth (to Allah) repentant.

(33) As for that which We inspire in thee of the Scripture, it is the Truth confirming that which was (revealed) before it. Lo! Allah is indeed observer, Seer of His slaves.

(34) Say: O My bondmen who believe! observe your duty to your Lord. For those who do good in this world there is good, and Allah's earth is spacious. Verily the steadfast will be paid their wages without stint.

(35) The believers are naught else than brothers. Therefore make peace between your brethren and observe your duty to Allah that haply ye may obtain mercy.

(36) Have they not then observed the sky above them, how We have constructed it and beautified it, and how there are no rifts therein?

(37) He uttereth no word but there is with him an observer ready.

(38) Didst thou (O Muhammad) observe him who turned away,

(39) But observe the measure strictly, nor fall short thereof.

(40) Have ye observed the water which ye drink?