The way to keep that output from showing up in the command is to stop those advertisements. (and those advertisements are an indication that you are acting like a transit network that would forward traffic through your network for them) The most common way to prevent these advertisements is to configure an AS filter and to only advertise prefixes that originate in your own network.
neighbor x.x.x.x filter-list 1 out <-- x.x.x.x is the IP address of the ISP peer router
ip as-path access-list 1 permit ^$
The regex ^$ matches AS PATHs with no AS numbers in it which is what you want because for your internal networks in the BGP table there is no AS in the AS_PATH attribute. Any routes received from your ISP will have at least one AS in the path and so will not be advertised back out.
Edit - just to be on the safe side it's always worth checking your BGP table before doing this. When you do a "sh ip bgp" all your networks should have no AS numbers in the path and all the ISP learned routes will have.
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