﴿ وَلَئِنْ أَتَيْتَ ٱلَّذِينَ أُوتُوا۟ ٱلْكِتَٰبَ بِكُلِّ ءَايَةٍۢ مَّا تَبِعُوا۟ قِبْلَتَكَ ۚ وَمَآ أَنتَ بِتَابِعٍۢ قِبْلَتَهُمْ ۚ وَمَا بَعْضُهُم بِتَابِعٍۢ قِبْلَةَ بَعْضٍۢ ۚ وَلَئِنِ ٱتَّبَعْتَ أَهْوَآءَهُم مِّنۢ بَعْدِ مَا جَآءَكَ مِنَ ٱلْعِلْمِ ۙ إِنَّكَ إِذًۭا لَّمِنَ ٱلظَّٰلِمِينَ ﴾

“And yet, even if thou wert to place all evidence before those who have been vouchsafed earlier revelation, they would not follow thy direction of prayer; and neither mayest thou follow their direction of prayer, nor even do they follow one another's direction. And if thou shouldst follow their errant views after all the knowledge that has come unto thee thou wouldst surely be among the evildoers.”

Yet if wa-la-in the lām is for oaths you should bring to those who have been given the Scripture every sign about your truthfulness in the matter of the direction of prayer they will not follow your direction out of obduracy and you are not a follower of their direction this is a categorical negation of his the Prophet’s desire that they become Muslims and of their desire that he return to their direction of prayer; neither are they the Jews and the Christians followers of one another’s direction. If you were to follow their whims the ones to which they summon you after the knowledge the revelation that has come to you then you if hypothetically you were to follow them will surely be among the evildoers.