(16) باب التَّشَهُّدِ فِي الصَّلاَةِ
Shu'ba has narrated this on the authority of Mansur with the same chain of transmitters, but he made no mention of this:
" Then he may choose any supplication which pleases him."
Reference: Sahih Muslim 402 b
In-book reference: Book 4, Hadith 60
USC-MSA web (English) reference(deprecated numbering scheme): Book 4, Hadith 794