It is narrated from the Mother of the Believers Sayyidah Hafsah (may Allah be pleased with her) that she said: "O Messenger of Allah (peace and blessings be upon him)! When you are ill, you put Sayyiduna Abu Bakr (may Allah be pleased with him) forward (to lead the prayer)?" So he (peace and blessings be upon him) said: "It was not I who put him forward; rather, it was Allah who put him forward."
Imam al-Tabarani (may Allah have mercy on him) said: "This hadith is not narrated from Yahya bin Qays except with this chain; al-Salt is alone in narrating it."
Hadith Referenceالمعجم الأوسط / باب الألف / 2848
Hadith Gradingمحدثین:إسناده ضعيف، فيه من لم يعرفه الهيثمي
Hadith Takhrij«قال الهيثمي: وفيه من لم أعرفه «مجمع الزوائد ومنبع الفوائد، ج 5، ص 181»»