If a person performs hajj, salaah & sawn sincerely, but commits shirk in du’aa, all the reward from the hajj, salaah & sawn will be nullified.
Proof: Surah Az-Zumar Aayah 65.*
Source: Sharh Usool Ath-Thalaatha’ Lesson 6. By Sh Abdur Razzaaq Al-Badr
7/14/18, 1:13 AM
(وَلَقَدْ أُوحِيَ إِلَيْكَ وَإِلَى الَّذِينَ مِن قَبْلِكَ لَئِنْ أَشْرَكْتَ لَيَحْبَطَنَّ عَمَلُكَ وَلَتَكُونَنَّ مِنَ الْخَاسِرِينَ (65*
Translation: And it was already revealed to you and to those before you that if you should associate [anything] with Allah, your work would surely become worthless, and you would surely be among the losers. Surah Az-Zumar 39: 65