Pronouncing kaaf incorrectly
Q: I was reacting tashahud in the first sitting or last sitting (can't remember) of 4 rakat isha salah. I did not pronounce the small "kaaf" when I was reading "wa Rahmatullahi was barakatu" the kaaf of barakatu. So I went back to "wa Rahmatullahi" the recited from there till the end. Is my salah valid?