It is authentic and saheeh.

I’ve read that sheikh albani has classified the adhkar while in ruku ‘subhana rabbiyal azeem wabihamdihi’ & that in sujood ‘subhana rabbiyal alaa wabihamdihi’ as saheeh in his ‘sifat us salah’, while later on, he classified it as da’eef in his work ‘daef?

Hadeeth & its Sciences | February 23, 2014 6:13 pm
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Ya sheikh does the following hadeeth, “Verily, if Allaah bestows a favorupon a worshipper, he likes that the signs of that favor are visible.” [Saheeh al-Jaami as-Sagheer wa Ziyaadatuh’] imply that we should show signs of the wealth we poses, i.e. reflecting our status by our clothing,lodging and diet etc. But if so,Does not that go against the understanding of our The Khulaafaa(RadhiALLAHu’Ajmaeen),especially ‘Umar bin Khattab(RadhiALLAHu’Anhu)?

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The Measenger `alayhi salaatu wassalaam said: “O Mu’adh, by Allah I love you, by Allah I love you.” Then he said, “I advise you, O Mu’adh, do not fail following every prayer to say: O Allah help me to remember You, thank You and worship You properly.”