Why is it called 'al-Muqaddasah'?

)يَٰقَوْمِ ٱدْخُلُوا۟ ٱلْأَرْضَ ٱلْمُقَدَّسَةَ ٱلَّتِى كَتَبَ ٱللَّهُ لَكُمْ وَلَا تَرْتَدُّوا۟ عَلَىٰٓ أَدْبَارِكُمْ فَتَنقَلِبُوا۟ خَٰسِرِينَ(

“My people! Enter the Holy Land (al-Arḍ al-Muqaddasah) that Allah ordained for you. Do not turn back in your tracks and thus become losers.” [al-Māʾidah 5:21]

Imam ʿAbdur Raḥmān ibn al-Jawzī (d.597 AH) : ‘Regarding the meaning of al-muqaddasah there are two positions. The first is that it is purified (muṭahharah), which was stated by Ibn ʿAbbās and az-Zajjāj, who said, “A bucket (saṭl) is called qadas because one purifies oneself from it”. It was called Bayt al-Maqdis because one purifies oneself of sins therein.  It has also been said that it was called muqaddasah because it was purified of idolatry and made an abode for the Prophets and the believers. The second is that it is blessed (mubārakah), which was stated by al-Mujāhid.’ [Zād al-Masīr fī ʿIlm at-Tafsīr (Beirut: Dār Ibn Hazm, 1423/2002), 370. See also Faḍāʾil Bayt al-Maqdis by the same author (Beirut: Dār Ibn Hazm, 1400/1980), 67]

For further knowledge from this tafsīr, listen from 58:10 of this video.