Muhammad said: The meaning of "tatajafa" is to depart. "And from what We have provided them, they spend" means: the obligatory Zakat.
قَالَ مُحَمَّد: معنى ﴿تَتَجَافَى﴾ تفارق. ﴿وَمِمَّا رَزَقْنَاهُمْ يُنْفقُونَ﴾ يَعْنِي: الزَّكَاة الْمَفْرُوضَة