Sayyiduna Sa'd bin Malik (may Allah be pleased with him) narrates that the Prophet (peace and blessings be upon him) said: "The best remembrance is that which is hidden, and the best provision is that which suffices."
Ahmad and Abu Ya'la recorded it; its chain contains Muhammad bin Abd al-Rahman bin Labibah, whom Ibn Hibban declared trustworthy, and he said: He narrated from Sayyiduna Sa'd bin Abi Waqqas (may Allah be pleased with him). (Allamah Haythami says:) I say: Yahya bin Ma'in declared him da'if (weak). The rest of the narrators of both reports are the narrators of the Sahih.
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الأذكار / 16795
Hadith Gradingمحدثین:إسنادہ ضعیف
Hadith Takhrij«اخرجه ابو يعلي فى المسند (731) اخرجه احمد فى المسند (1478 و 1477) ، أخرجه مسند أحمد برقم: 1480، 1626»
Sayyidah Aishah Siddiqah (may Allah be pleased with her) narrates: The Prophet (peace and blessings be upon him) used to regard the prayer offered after using the tooth-stick (miswak) as seventy times more excellent than the prayer offered without using the tooth-stick. The Prophet (peace and blessings be upon him) said: "The remembrance that is hidden, which no one else hears, has seventy times more excellence." He (peace and blessings be upon him) said: "When it is the Day of Resurrection, Allah Almighty will gather all creation for their reckoning, and a person's guardian angels will bring what they preserved and what they recorded. Allah Almighty will say to them: 'Examine whether anything of this person remains.' The angels will say: 'O our Lord, we have not left out anything of what we knew; we preserved it, counted it and recorded it.' Then the Lord will say (to that servant): 'I have with Me something stored away for you of which you are unaware (so it is mentioned in the text, though perhaps the wording should be: of which these angels are unaware), and I will reward you for it, and that thing is the hidden remembrance.'"
Abu Ya'la recorded it; its chain contains Mu'awiyah bin Yahya al-Sadafi, who is da'if (weak).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الأذكار / 16796
Hadith Gradingمحدثین:إسنادہ ضعیف
Hadith Takhrij«اخرجه ابو يعلى فى المسند (4738) ، أخرجه المستدرك على الصحيحين برقم: 530، وأخرجه صحيح ابن خزيمة برقم: 137، وأخرجه المطالب العالية بزوائد المسانيد الثمانية برقم: 3411، وأخرجه إتحاف الخيرة المهرة بزوائد المسانيد العشرة برقم: 1229/2، 6071/1»