Redirect multipe links using htaccess

I have shifted my website from one place to another. I have high traffic in the first place, so I need to redirect it on specific pages mapping to the second place. There are almost one thousand articles, so I need one thousand redirections. How to do that through htaccess?

I am using the described below HTACCESS CODE for this purpose but it is not working:

Redirect https://websiteOLD.com/article1 https://websiteNEW.com/article1

Redirect https://websiteOLD.com/article2 https://websiteNEW.com/article2

Redirect https://websiteOLD.com/article3 https://websiteNEW.com/article3

Redirect https://websiteOLD.com/article4 https://websiteNEW.com/article4

Redirect https://websiteOLD.com/article5 https://websiteNEW.com/article5

Redirect https://websiteOLD.com/article6 https://websiteNEW.com/article6

Whats wrong with the above described code lines? I have almost one thousand of such lines mapping each WordPress article from old domain to the new domain.