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Sourcing a file does not require it to be executable.

To preserve the carriage return, enclose the variable in quotes:

echo "$message3"
. filename [arguments]
source filename...

just source it.

$ cat var.txt
message1="Reason for error code1"
message2="Reason for error code2"
message3="Reason for error code3.
To solve this, you may try doing...