NET
29 Otherwise, when he has laid a foundation and is not able to finish the tower, all who see it will begin to make fun of him.
Darby
29 in order that, having laid the foundation of it, and not being able to finish it, all who see it do not begin to mock at him,
KJV
29 “Lest haply, after he hath laid the foundation, and is not able to finish” [it], “all that behold” [it] “begin to mock him,”