Sayyiduna Anas (may Allah be pleased with him) says that I heard the Messenger of Allah (peace and blessings be upon him) say: "Whoever performs twelve rak‘ahs of Duha prayer, Allah Almighty will build for him a palace of gold in Paradise."
Hadith Referenceمعجم صغير للطبراني / كتاب الصلوٰة / 249
Hadith Gradingمحدثین:إسناده ضعيف
Hadith Takhrij«إسناده ضعيف ، أخرجه الترمذي فى «جامعه» برقم: 473، وابن ماجه فى «سننه» برقم: 1380، والطبراني فى «الأوسط» برقم: 3955، والطبراني فى «الصغير» برقم: 506 قال الشيخ الألباني: ضعيف»
´Anas bin Malik narrated that :` Allah's Messenger said: "Whoever prays twelve Rak'ah of Ad-Duha, Allah will build a castle made of gold for him in Paradise."
Shaykh Dr. Abdur Rahman Freywai
Commentary: 1: With this context and wording, this hadith is weak, not the actual forenoon (duha) prayer itself. The following hadith is authentic, from which the proof of eight units (rak‘ahs) of the forenoon (duha) prayer is established.
Note: (In the chain of narration, Musa ibn Fulan ibn Anas is an unknown (majhool) narrator.)
Source: Sunan al-Tirmidhi – Majlis ‘Ilmi Dar al-Da‘wah, New Delhi Edition, Page: 473
Narrated Anas (RA): Allah's Messenger (ﷺ) said: "Whoever prays twelve Rak'at of Duha, Allah will build a castle for him in Paradise." [Reported by at-Tirmidhi who graded it Gharib (reported by a single narrator)].
Explanation: Our esteemed researcher has declared the aforementioned narration to be weak; therefore, the maximum number of rak‘ahs for Salat al-Duha is eight, which is established from the ahadith of Sahih al-Bukhari and Sahih Muslim, as has been discussed in detail in the previous ahadith. In any case, the virtue of Salat al-Duha is also established from other ahadith. And Allah knows best.
Source: Bulugh al-Maram: Commentary by Safiur Rahman Mubarakpuri, Page: 312