What connects maṭliʿ al-shams and maṭliʿ al-jūd?

Final Chapter: Excellence of Opening, Barāʿat al-Istihlāl, Transition and Conclusion

• All words having one triliteral root
• The shared rising-place image and a shift from sunlight to generosity
• The expressions being exact synonyms
• Deleting the meaning of generosity