Linux shell script reads multiple files per line

Existing file1, file2, file3 three files, the contents are as follows

$cat File1f1_1f1_2f1_3$cat File2f2_1f2_2f2_3$cat File3f3_1f3_2f3_3

Write a shell script to read these three files line by row

#!/bin/bashcat file1 file2 file3 |while read P do echo $p done

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Thinking

How do I introduce multiple files with done?

#!/bin/bash
While read P
Do
Echo $p
Done < {several_input_files}

Linux shell script reads multiple files per line