In The Name of Allah, The Most Merciful, The Bestower of Mercy.

Allah, The Most High, said:

وَإِذۡ أَخَذۡنَا مِنَ ٱلنَّبِيِّـۧنَ مِيثَـٰقَهُمۡ وَمِنكَ وَمِن نُّوحٍ۬ وَإِبۡرَٲهِيمَ وَمُوسَىٰ وَعِيسَى ٱبۡنِ مَرۡيَمَ‌ۖ وَأَخَذۡنَا مِنۡهُم مِّيثَـٰقًا غَلِيظً۬ا
لِّيَسۡـَٔلَ ٱلصَّـٰدِقِينَ عَن صِدۡقِهِمۡ‌ۚ وَأَعَدَّ لِلۡكَـٰفِرِينَ عَذَابًا أَلِيمً۬ا

And (remember) when We took from the Prophets their covenant, and from you (O Muhammad ), and from Nuh (Noah), Ibrahim (Abraham), Musa (Moses), and ‘Iesa (Jesus), son of Maryam (Mary). We took from them a strong covenant. That He may ask the truthful about their truth. [Al-Ahzaab. 7-8]

لِّيَسۡـَٔلَ ٱلصَّـٰدِقِينَ عَن صِدۡقِهِمۡ‌ۚ

That He may ask the truthful about their truth.

Imam Ibn Al-Qayyim, may Allah have mercy upon him, said:

When it is the case that the truthful ones will be brought to account regarding their truthfulness, then what would one think about the liars? [Bada’i at-Tafsir Al-Jami Limaa Fassarahu Al-Imam Ibn Al-Qayyim 2/327]

Aa’ishah, may Allah be pleased with her, narrated:

“There was no trait more hated to Allah’s Messenger, peace and blessings of Allah be upon him, than lying. A man would speak based on lies in the presence of the Prophet, peace and blessings of Allah be upon him, and he would not be content until he knew that he had repented”. [Sahih Tirmidhi 1973]