Phrases such as "click the ads," "support our sponsors," "visit these recommended links," or other similar language that could apply to the Google ads on your site is
not allowled. Which means publishers are not permitted to label the Google ads with text other than "sponsored links" or "advertisements." This is beacuse for most AdSense for content and AdSense for search ads are served on a cost per click (CPC) or cost per thousand impression (CPM) basis. It's generally harder for an advertiser to decide on a CPC/CPM value than it is to decide on a Cost per Action CPA (like in Google Referral program) value because multiple factors go into deciding the value of a click or impression. Encouraging clicks on these ads not only drives lower quality traffic to an advertiser’s site but provides poor data for an advertiser to make an appropriate bid on the click. This results in a poor experience for visitors and advertisers, which isn’t good for you as a publisher. So visitors should only click on Google ads if they're interested in the services being advertised. Encouraging them to click on your Google ads, either directly or indirectly, can lead to inflated advertiser costs and this may can cause an account to be disabled.
Read more on this program policy