Til the last breath.
Aboo Ja’far at-Tastaree said:
I went to Aboo Zur’ah (ar-Raazee) whilst he was on his death bed and with him was Aboo Haatim and Muhammad bin Muslim and al-Mundhir bin Shaathaan along with a group of scholars. And they mentioned the hadith of Talqeen (making the dying person utter the Shahaadah) and the Prophets statement:
“Make your dead (dying) pronounce laa ilaaha illaAllaah”
But they became shy around Aboo Zur’ah and felt embarssed to remind him.
So they said to eachother, come and lets mention the hadith (perhaps Aboo Zur’ah will realise) so Muhammad bin Muslim started of, he said:
It was narrated by ad-Dhahaak bin Makhlad on the authority of ‘Abdi al-Hameed bin Ja’far on the authority of Saalih…
And he stopped narrating and couldnt continue (as if he forgot the chain)
Aboo Haatim took over and said:
It was narrated by Bundaar that he said it was narrated by Aboo ‘Aasim on the authority of ‘Abdi al-Hameed bin Ja’far on the authority of Saalih…
But even he stopped there.
And the rest of the scholars were all silent
Then Aboo Zur’ah said whilst on his death bed.
It was narrated to us by Bundaar that he said it was narrated to us by Aboo ‘Aasim that he said it was narrated to us by ‘Abdi al-Hameed on the authority of Saalih bin Abee ‘Areeb on the authority of Katheer bin Murrah al-Hadhramee on the authority of Mu’aadh bin Jabal that he said the Messenger of Allaah said:
“Whoever makes his last utterance laa ilaaha illaAllaah enters Jannah”
And then he (Aboo Zur’ah) passed away.
[Translated from Tahdeeb al-Kamaal by al-Haafidh al-Mizzi]