Insert multiple lines of text before specific line using Bash

Question

I am trying to insert a few lines of text before a specific line, but keep getting sed errors when I try to add a new line character. My command looks like:

Answer 1

This ll works from the first line.. For eg: If you want to insert from 3rd line of a file, replace "1i" to "3i".

sed -i '1i line1'\\n'line2'\\n'line3' 1.txt 

cat 1.txt

 line1
 line2
 line3
 Hai