Sadullah was one of the worst opponents of the Promised Messiah (as) who crossed all limits in hurling abuses against him. Regarding him Hadrat Ahmad (as) writes:
“When Munshi Sa‘dullah of Ludhiana exceeded all limits in his foul and abusive diatribes, and hurled so much abuse upon me, employing prose and poetry, that I believe he had the filthiest tongue from among my foul-mouthed enemies in the Punjab, it was then that I prayed to God Almighty that he may die a death of disappointment during my own lifetime and may his death be disgraceful. His verbal abuses were not the solitary cause of this prayer; rather, its main cause was that he was desirous of my death and used to heap curses upon me in verse and prose.” (Haqiqatul Wahi English, p. 540-541)
He (as) then prophesied that Sadullah would perish in the plague and this prophecy was fulfilled. Opponents have no response to the prophecy and instead raise an allegation against Hadrat Masih Maud (as) for calling Sadullah ‘ibn bagha’. They translate this as son of adulterer. However, this translation is incorrect because the Promised Messiah (as) himself translates it differently in his Malfuzat, and his translation will take preference over all others.
Ahmadas has also himself referred to the Arabic word ابن بغاء and has translated it as a rebellious man rather than the son of an adulterer.It is stated in regards to Sadullah of Ludhiana in a Qasidah that:
آذَيتَنى خبثًا فلَسْتُ بصادق إنْ لم تَمُتْ بالخزي يا ابنَ بغاءِ
“You have given me grief by your wickdness; If now you are not destroyed in disgrace, I am false in my claim O rebellious man! (Al-Hakam, Volume 11, No. 7, 24 February 1907, p. 13).