The word(s) "therefore" appears 67 time(s) in 66 verse(s) in Quran in Abdullah Yusuf Ali translation.

(11) Now when they saw no hope of his (yielding), they held a conference in private. The leader among them said: "Know ye not that your father did take an oath from you in Allah's name, and how, before this, ye did fail in your duty with Joseph? therefore will I not leave this land until my father permits me, or Allah commands me; and He is the best to command.

(12) therefore, by the Lord, We will, of a surety, call them to account,

(13) therefore expound openly what thou art commanded, and turn away from those who join false gods with Allah.

(14) (Some) say they were three, the dog being the fourth among them; (others) say they were five, the dog being the sixth,- doubtfully guessing at the unknown; (yet others) say they were seven, the dog being the eighth. Say thou: "My Lord knoweth best their number; It is but few that know their (real case)." Enter not, therefore, into controversies concerning them, except on a matter that is clear, nor consult any of them about (the affair of) the Sleepers.

(15) He said: "(The power) in which my Lord has established me is better (than tribute): Help me therefore with strength (and labour): I will erect a strong barrier between you and them:

(16) Verily Allah is my Lord and your Lord: Him therefore serve ye: this is a Way that is straight.

(17) "Verily I am thy Lord! therefore (in My presence) put off thy shoes: thou art in the sacred valley Tuwa.

(18) "therefore let not such as believe not therein but follow their own lusts, divert thee therefrom, lest thou perish!"..

(19) "So go ye both to him, and say, 'Verily we are messengers sent by thy Lord: Send forth, therefore, the Children of Israel with us, and afflict them not: with a Sign, indeed, have we come from thy Lord! and peace to all who follow guidance!

(20) "therefore concert your plan, and then assemble in (serried) ranks: He wins (all along) today who gains the upper hand."