Abomination of Joining As-Salat (The Prayer) when the Food is ready or when one is in desperate need to answer the call of Nature

Anas bin Malik (May Allah be pleased with him) said:
The Messenger of Allah ﷺ said, "How is it that some people raise their eyes towards the sky during As-Salat (the prayer)?" He stressed (this point) and added, "People must refrain from raising their eyes towards heaven in Salat (prayer), or else their sights will certainly be snatched away."

[Al-Bukhari].

عن أنس بن مالك قَالَ : قَالَ رسولُ اللهِ : « مَا بَالُ أقْوامٍ يَرْفَعُونَ أبْصَارَهُمْ إِلَى السَّمَاءِ في صَلاَتِهِمْ » ! فَاشْتَدَّ قَولُهُ في ذَلِكَ حَتَّى قَالَ : « لَيَنْتَهُنَّ عَنْ ذَلِكَ ، أَوْ لَتُخطفَنَّ أَبْصَارُهُمْ » ! . رواه البخاري