How to Delete patern from multiple files

I’ve a data files with information like this : 977.txt:[email protected] 977.txt:[email protected] 980.txt:[email protected] 982.txt:[email protected] 985.txt:[email protected] 987.txt:[email protected] 987.txt:[email protected] 991.txt:[email protected] 991.txt:[email protected] 991.txt:[email protected] 994.txt:[email protected] 995.txt:[email protected] 999.txt:[email protected] i want to remove everything before : how can i do that for all files in directory ( Linux )

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