Is it proven that the righteous wife will have a reward like that of one who fasts and prays qiyaam?
I once read a hadith in an islamic forum but the reference for the hadith was not mentioned. The hadith sounds beautiful but i'll love to confirm it's authenticity before i quote it to anyone. The hadith goes like this, the Prophet(saw) said, " When one of youdoes her best to be a good wife, The reward equals someone who is fasting all day and praying all night." I'll really appreciate your help.
Praise be to Allah.
Perhaps you are referring to the report that was narrated by at-Tabaraani in al-Mu'jam al-Awsat , and Ibn 'Asaakir in his Tareekh [43/348], via 'Amr ibn Sa'eed al-Khawlaani from Anas ibn Maalik, according to which Salaamah the nurse of Ibraaheem, the son of the Prophet (blessings and peace of Allah be upon him), said: "O Messenger of Allah, you give the men all kinds of glad tidings but you do not give the women such glad tidings?", He said: «»".
This hadeeth is fabricated. It was narrated by Ibn al-Jawzi in al-Mawdoo'aat [2/274], He said: "Ibn Hibbaan said: "Amr ibn Sa'eed is the one who narrated this fabricated hadeeth from Anas; it is not permissible to quote it except by way of highlighting an example of a fabricated hadeeth. And as-Suyooti agreed with him in al-La'aali' [2/175] (End quote, Silsilat al-Ahaadeeth ad-Da'eefah wa'l-Mawdoo'iyyah [5/76]).
It was also narrated by Ibn Hibbaan in al-Majrooheen [1/238] and by Ibn 'Adiyy in al-Kaamil [3/167] via al-Hasan ibn Muhammad al-Balkhi from 'Awf al-A‘raabi from Ibn Sireen from Abu Hurayrah, who said: "The Messenger of Allah (blessings and peace of Allah be upon him) said: «»", Ibn 'Adiyy said: "It is munkar (odd), It was also narrated by Ibn al-Jawzi in al-Mawdoo'aat [2/274], Al-Albaani said in ad-Da'eefah : "It is mawdoo' (fabricated)".
There is no need for this fabricated report, because we have the report that was narrated by Imam Ahmad  from 'Abd ar-Rahmaan ibn 'Awf (may Allah be pleased with him) who said: "The Messenger of Allah (blessings and peace of Allah be upon him) said: «» (Classed as saheeh by al-Albaani in Saheeh al-Jaami' ).
And Allah knows best.