The word(s) "best" appears 206 time(s) in 195 verse(s) in Quran in Mohsin Khan translation.

(91) (Remember) when the young men fled for refuge (from their disbelieving folk) to the Cave. They said: "Our Lord! bestow on us mercy from Yourself, and facilitate for us our affair in the right way!"

(92) Then We raised them up (from their sleep), that We might test which of the two parties was best at calculating the time period that they had tarried.

(93) And We made their hearts firm and strong (with the light of Faith in Allah and bestowed upon them patience to bear the separation of their kith and kin and dwellings) when they stood up and said: "Our Lord is the Lord of the heavens and the earth, never shall we call upon any ilah (god) other than Him; if we did, we should indeed have uttered an enormity in disbelief.

(94) Likewise, We awakened them (from their long deep sleep) that they might question one another. A speaker from among them said: "How long have you stayed (here)?" They said: "We have stayed (perhaps) a day or part of a day." They said: "Your Lord (Alone) knows best how long you have stayed (here). So send one of you with this silver coin of yours to the town, and let him find out which is the good lawful food, and bring some of that to you. And let him be careful and let no man know of you.

(95) And thus We made their case known (to the people), that they might know that the Promise of Allah is true, and that there can be no doubt about the Hour. (Remember) when they (the people of the city) disputed among themselves about their case, they said: "Construct a building over them; their Lord knows best about them;" (then) those who won their point said (most probably the disbelievers): "We verily shall build a place of worship over them."

(96) (Some) say they were three, the dog being the fourth among them; and (others) say they were five, the dog being the sixth, - guessing at the unseen; (yet others) say they were seven, and the dog being the eighth. Say (O Muhammad صلى الله عليه وسلم): "My Lord knows best their number; none knows them but a few." So debate not (about their number) except with the clear proof (which We have revealed to you). And consult not any of them (people of the Scripture - Jews and Christians) about (the affair of) the people of the Cave.

(97) Say: "Allah knows best how long they stayed. With Him is (the knowledge of) the Unseen of the heavens and the earth. How clearly He sees, and hears (everything)! They have no Wali (Helper, Disposer of affairs, Protector) other than Him, and He makes none to share in His Decision and His Rule."

(98) There (on the Day of Resurrection), Al-Walayah (protection, power, authority and kingdom) will be for Allah (Alone), the True God. He (Allah) is the best for reward and the best for the final end. (La ilaha illallah- none has the right to be worshipped but Allah).

(99) Then they found one of Our slaves, on whom We had bestowed mercy from Us, and whom We had taught knowledge from Us.

(100) "But as for him who believes (in Allah's Oneness) and works righteousness, he shall have the best reward, (Paradise), and we (Dhul-Qarnain) shall speak unto him mild words (as instructions)."