Charak Samhita
विषमारम्भमूलानां लिङ्गमेकं ज्वरो मतः । ज्वरस्यैकस्य चाप्येकः सन्तापो लिङ्गमुच्यते ॥२८॥
One symptom i.e. jwara can be considered common to many diseases that have irregular onset, while santapa (elevated temperature) is considered a symptom of only one disease i.e. jwara.
english translation
viSamArambhamUlAnAM liGgamekaM jvaro mataH । jvarasyaikasya cApyekaH santApo liGgamucyate ॥28॥
hk transliteration by Sanscript