John Gill Commentary Acts 5:2

"and kept back [part] of the price, his wife also being privy to it, and brought a certain part, and laid it at the apostles` feet." — Acts 5:2 (ASV)

And kept back part of the price
At which the possession was sold; he reserved it for his own use, after he had given out that he sold it for the service of the church:

his wife also being privy to it ;
to this private reserve:

and brought a certain part ;
whether the greater part, or an equal part, half of it, or a lesser part; some little part of it, so the phrase seems to signify, is not certain:

and laid it at the apostles' feet ;
as the rest did, thereby to make a show of charity, and cover the deceit.