insert a line with file which has sed command in linux

I am trying to insert line in a file which will have a sed command to insert a line in another file
Like below for eg :
want to add this line sed -i '1s/^/insideFile\n/' secondFile.sh to 65th line of firstfile.txt

I tried:

sed -i '65s/^/\'sed -i \'1s/^/insideFile\n/\' secondFile.sh\'\n/' firstfile.sh

but not able to escape the '

also tried

sed -i "65s/^/'sed -i "1s/^/topLine\n/" $FILE_HOME_LOCAL_FILE'\n/" secondFile.sh

but got
sed: -e expression #1, char 18: unknown option to `s

>Solution :

You may use this sed:

sed -i.bak "65s~^~sed -i '1s/^/insideFile\\\\n/' secondFile.sh\\n~" firstfile.sh

Note:

• Use of alternate delimiter ~ to avoid escaping /
• use of double quotes for your sed command to avoid escaping single quotes
• use of \\\\ to insert a single \
• use of \\n inside double quotes to insert a line break

Alternatively with i (insert) instead of s (substitute):

sed -i.bak "65i\\
sed -i '1s/^/insideFile\\\\n/' secondFile.sh\\
" firstfile.sh