Yellowness in saliva: does it require ablution or not?

Sulayman said: Sometimes Ibn Sirin would spit and then say to a man: Look, has its colour changed? If it had changed, he would spit a second time; if on the third time it had still changed, he would perform ablution; and if on the third time it had not changed, he would not perform ablution.

Concerning a man who spits and sees blood in his spittle, al-Hasan said that his ablution is not broken unless pure fresh blood comes out.

Concerning a man who spits and there is yellowness in his spittle, al-Hasan said that his ablution is not broken unless pure fresh blood comes out.

Ibrahim (concerning a man who spits and blood appears in his spittle) said: If the red overcomes the white, his ablution is broken; and if the white overcomes the red, his ablution is not broken.

Muhammad bin Abdullah said: Once Salim spat, and it was red blood. He called for water, rinsed his mouth, and entered the mosque without performing ablution.

Ata bin al-Sa'ib said: Sayyiduna Ibn Abi Awfa (may Allah be pleased with him) spat blood during the prayer, but he continued with his prayer.

Hammad (concerning a man who is in a state of ablution and sees yellowness in his spittle) said: Nothing results from it; however, if it is flowing blood, his ablution is broken.

Salim and al-Qasim said concerning yellowness in spittle: Leave what makes you doubt for what does not make you doubt.

Amir said concerning yellowness in spittle: There is no harm in it.

Al-Harith al-Ukli (concerning a man who spits and there is a trace of blood in his spittle) said: If the blood overcomes the spittle, his ablution is broken.

Qatadah said: If the blood overcomes the spittle, perform ablution.