The safest version for Android 4.2.2 is Facebook v327.0.0.28.115 (uploaded to APKMirror in October 2019).
On Android 4.2.2, Google introduced a security feature that blocks apps from outside the Play Store. Here is how to disable it: facebookapk for android 422
Running Facebook on an older device like one with Android 4.2.2 (Jelly Bean) The safest version for Android 4