The word(s) "before" appears 356 time(s) in 337 verse(s) in Quran in Mohsin Khan translation.

(281) And indeed We tried before them Fir'aun's (Pharaoh) people, when there came to them a noble Messenger [i.e. Musa (Moses) عليه السلام],

(282) Are they better or the people of Tubba' and those before them? We destroyed them because they were indeed Mujrimun (disbelievers, polytheists, sinners, criminals).

(283) Then We have put you (O Muhammad صلى الله عليه و سلم) on a (plain) way of (Our) commandment [like the one which We commanded Our Messengers before you (i.e. legal ways and laws of the Islamic Monotheism)]. So follow you that (Islamic Monotheism and its laws), and follow not the desires of those who know not. (Tafsir At-Tabari).

(284) Say (O Muhammad صلى الله عليه وسلم to these pagans): "Think you about all that you invoke besides Allah? Show me. What have they created of the earth? Or have they a share in (the creation of) the heavens? Bring me a Book (revealed before this), or some trace of knowledge (in support of your claims), if you are truthful!"

(285) And before this was the Scripture of Musa (Moses) as a guide and a mercy. And this is a confirming Book (the Qur'an) in the Arabic language, to warn those who do wrong, and as glad tidings to the Muhsinun (good-doers. See the footnote of V.9:120).

(286) But he who says to his parents: "Fie upon you both! Do you hold out the promise to me that I shall be raised up (again) when generations before me have passed away (without rising)?" While they (father and mother) invoke Allah for help (and rebuke their son): "Woe to you! Believe! Verily, the Promise of Allah is true." But he says: "This is nothing but the tales of the ancient."

(287) And remember (Hud) the brother of 'Ad, when he warned his people in Al-Ahqaf (the curved sand-hills in the southern part of Arabian Peninsula). And surely, there have passed away warners before him and after him (saying): "Worship none but Allah; truly, I fear for you the torment of a mighty Day (i.e. the Day of Resurrection)."

(288) Then why did those whom they had taken for alihah (gods) besides Allah, as a way of approach (to Allah) not help them? Nay, but they vanished completely from them (when there came the torment). And that was their lie, and their inventions which they had been inventing (before their destruction).

(289) They said: "O our people! Verily, we have heard a Book (this Qur'an) sent down after Musa (Moses), confirming what came before it: it guides to the truth and to the Straight Path (i.e. Islam).

(290) Have they not travelled through the earth, and seen what was the end of those before them? Allah destroyed them completely, and a similar (fate awaits) the disbelievers.