Genesis 16:10

I will multiply thy seed. God recognized the difficult circumstances in which Hagar found herself, and for which she was not primarily to blame. Hagar honored the true God, and He would not abandon her in her extremity. The promise He there made to her, a slave, is without parallel. This promise greatly comforted Hagar. Although her son was not to be the son of the divine plan, he would nevertheless share in the promise made to Abram. God had promised to multiply Abram’s seed, without limiting it to the offspring of Sarai. Therefore He would abide by His promise to the very letter, but reserve the spiritual blessing for the seed originally intended by the promise, that is, Isaac (see Gal. 4:23-30; Rom. 9:7, 8).