(a) Through another chain, a similar narration is also reported from Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him); at its end it says: "Then let each of you make whatever supplication he wishes."
(b) Imam al-Bukhari (may Allah have mercy on him) recorded this narration in his Sahih through the chain of Musaddad from Yahya al-Qattan. Likewise, Mansur narrated it from Shaqiq, and at its end it says: "Then, after that, let him ask for whatever he wishes."
(c) The Messenger of Allah (peace and blessings be upon him) supplicated in his prayer in favour of certain peoples, and also supplicated against certain peoples, naming them; this subject will come in its proper place, if Allah wills.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 2878